Slow evolution of magnetic potential fields in barotropic
|
|
- Bethany Johnston
- 6 years ago
- Views:
Transcription
1 Slow evolution of magnetic potential fields in barotropic ideal MHD flows Dieter Nickeler Astronomical Institute, Ondřejov in collaboration with Marian Karlický
2 Overview Motivation: Magnetic structures in pre-flare stages
3 Overview Motivation: Magnetic structures in pre-flare stages Assumptions and basic (evolution) MHD equations: Is it possible to find barotropic flows which enable a sequence of magnetic potential fields?
4 Overview Motivation: Magnetic structures in pre-flare stages Assumptions and basic (evolution) MHD equations: Is it possible to find barotropic flows which enable a sequence of magnetic potential fields? Possible solution methods and preliminary results: Characteristics and restriction to general solution of ideal Ohm s law
5 Overview Motivation: Magnetic structures in pre-flare stages Assumptions and basic (evolution) MHD equations: Is it possible to find barotropic flows which enable a sequence of magnetic potential fields? Possible solution methods and preliminary results: Characteristics and restriction to general solution of ideal Ohm s law Problems and Outlook
6 What we want: Aims: (i) We would like to find expressions for restrictions for the (general) solution of the ideal Ohm s law using characteristic method (problem of correct boundary and initial conditions)
7 What we want: Aims: (i) We would like to find expressions for restrictions for the (general) solution of the ideal Ohm s law using characteristic method (problem of correct boundary and initial conditions) (ii) We want to find stable/asymptotical time independent and/or unstable/collapsing solutions which could serve as models for pre-flare stages
8 What we want: Aims: (i) We would like to find expressions for restrictions for the (general) solution of the ideal Ohm s law using characteristic method (problem of correct boundary and initial conditions) (ii) We want to find stable/asymptotical time independent and/or unstable/collapsing solutions which could serve as models for pre-flare stages (iii) First attempt to to tackle this problem analytically and dynamically and not only magnetically or kinematically
9 Interesting example: Example of magnetic structures (potential fields) in the solar corona: Plasma β is small: p Pa, B 10 2 T, thus β = p/(b 2 /2µ 0 ) thus pressure gradient is zero, therefore Euler equation can be neglected, but unfortunately if we are in the vicinity of magnetic neutral points...??? plasma β pressure gradient cannot be neglected
10 Assumptions and basic MHD equations Assumptions new: The nonlinear part of the Euler equation should be neglected but not the partial derivative, implying v v S, v 0 and / t 0 assuming a barotropic law p = p(ρ) Solving the problem in pure 2D, / z = 0, but all variables are in principle time dependent ( parametrically time dependent)
11 Assumptions and basic MHD equations Basic MHD equations I ρ t + ρ v = 0, ρ v = t p, A t + v A = 0, A = 0, where B = (A e z ) = A e z = φ m p = p(ρ) = v = 0 = v = ϕ
12 Assumptions and basic MHD equations Basic MHD equations and assumptions Neglecting the nonlinear term in the mass continuity equation: ϕ t 2 ϕ ϕ t ( ϕ ) ϕ, Thus it is at least no contradiction to the neglection of the ( v ) v-term in the Euler equation, as v ( ) t v v ϕ t ( ϕ ) ϕ.
13 Assumptions and basic MHD equations Basic MHD equations and assumptions But is it then really justified to reduce the mass continuity equation to: ρ t + ρ v = ρ t + ρ ϕ = 0? We assume that it is justified with respect to the hydrodynamical equations.
14 Assumptions and basic MHD equations Basic MHD equations II ρ t + ρ ϕ = 0, ϕ t = f ; f (ρ) := ϕ A = A t, A = 0, Z p (ρ) ρ dρ
15 Assumptions and basic MHD equations Basic MHD equations III ρ t + ρ ϕ = 0, f (ρ) = ϕ t ρ = 1 f ϕ A = A t, A = 0, ( ϕ t ) (.ϕ ) g
16 Assumptions and basic MHD equations Basic MHD equations IV g (. ϕ).. ϕ +g(. ϕ) ϕ = 0, ρ = g(. ϕ), ϕ A = A t, A = 0.
17 Example: The standard form of a potential field in the vicinity of a magnetic neutral point With A(x,y,t) = A 0 (t)xy we find the general solution of ideal Ohm s law by applying the characteristic method with ξ = x 2 y 2. A x ϕ x + A y ϕ y = A t A 0 y ϕ x + A 0x ϕ y = Ȧ 0 xy ϕ = f (ξ,t) G 2 x2, G :=. A0 A 0
18 Example: The isothermal approach Let Equation of change (state) p(ρ) = k B µ ρt 0 p (ρ) = k B µ T 0 f (ρ) = k ( ) BT 0 ρ µ ln ρ 0 [ g(. ϕ) = ρ 0 exp =. ϕ. µ ϕ 0. ϕ +. ϕ 0 k B T 0 ]
19 Example: The isothermal approach Resulting differential equation 1 v 2 S.. ϕ + ϕ = 0, which can be derived from [ g( ϕ).. ϕ +. ] ϕ 0 = ρ 0 exp µ k B T 0 µ g( ϕ). ϕ.. +g( ϕ) ϕ. = 0 k B T 0
20 Isothermal approach General solution of the differential equation Having in mind that G Ȧ 0 /A 0 = G 1 t + G 0 ( ) G1 A 0 = A 00 exp 2 t2 + G 0 t for a decaying magnetic field, i.e. G 1 < 0 and for large times (t ) ρ = f unction o f space and time exp ( t 2) magnetic field will decay, complete region around the null point will be evacuated
21 Polytropic approach With p = Kρ γ, γ = (C C p )/(C C V ) we get: Resulting differential equation.. ϕ +(γ 1). ϕ ϕ = 0. we insert the general solution ϕ = f (ξ,t) G 2 x2...
22 Preliminary and incomplete results. 1. G= 0 and f = 0, exponentially unstable (good for flares (?) ) if G 0 < 0 and γ < 1 or G 0 > 0 and γ > 1 delivers with respect to time unbounded solutions of the flow
23 Preliminary and incomplete results. 1. G= 0 and f = 0, exponentially unstable (good for flares (?) ) if G 0 < 0 and γ < 1 or G 0 > 0 and γ > 1 delivers with respect to time unbounded solutions of the flow. 2. G= 0, ḟ = 0 and f 0, ϕ = f (ξ) G 0 x 2 /2 (stationary flow)
24 Preliminary and incomplete results. 1. G= 0 and f = 0, exponentially unstable (good for flares (?) ) if G 0 < 0 and γ < 1 or G 0 > 0 and γ > 1 delivers with respect to time unbounded solutions of the flow. G= 0, ḟ = 0 and f 0, ϕ = f (ξ) G 0 x 2 /2 2. (stationary flow) 3.. G 0 and f = 0, (i) oscillating flux function, but diverging non-parallel parts of the flow (finite time singularity tan(t)) or (ii) finite time singularities of the parallel flow cosh(t), but bounded flux function tanh(t) (iii) flux function and non-parallel flow velocity obey finite time singularity 1/(t t 0 )
25 Conclusions: In the vicinity of magnetic null points there can exist several kinds of breakdown of slow or quasi-static approach: 1. Due to exponential instabilities
26 Conclusions: In the vicinity of magnetic null points there can exist several kinds of breakdown of slow or quasi-static approach: 1. Due to exponential instabilities 2. Due to finite time singularities
27 Problems and Outlook: Question: what determines the finite time intervall of the finite time singularities?
28 Problems and Outlook: Question: what determines the finite time intervall of the finite time singularities? How do the solutions look like if we allow the null point to move (at least linearly)?
29 Problems and Outlook: Question: what determines the finite time intervall of the finite time singularities? How do the solutions look like if we allow the null point to move (at least linearly)? How to connect the general solution with the characteristics for the velocity potential with the nonlinear mass continuity equation?
30 Problems and Outlook: Question: what determines the finite time intervall of the finite time singularities? How do the solutions look like if we allow the null point to move (at least linearly)? How to connect the general solution with the characteristics for the velocity potential with the nonlinear mass continuity equation? Finding solutions for the non-linear problem, extending the Syrovatskii solutions to systems with null points and non-vanishing pressure gradients
31 Problems and Outlook: Question: what determines the finite time intervall of the finite time singularities? How do the solutions look like if we allow the null point to move (at least linearly)? How to connect the general solution with the characteristics for the velocity potential with the nonlinear mass continuity equation? Finding solutions for the non-linear problem, extending the Syrovatskii solutions to systems with null points and non-vanishing pressure gradients More general barotropic law instead of a polytropic law
Fluid equations, magnetohydrodynamics
Fluid equations, magnetohydrodynamics Multi-fluid theory Equation of state Single-fluid theory Generalised Ohm s law Magnetic tension and plasma beta Stationarity and equilibria Validity of magnetohydrodynamics
More informationarxiv:astro-ph/ v1 27 May 2005
2D stationary resistive MHD flows: borderline to magnetic reconnection solutions D.H. Nickeler a,, H.-J. Fahr b arxiv:astro-ph/0505554v1 27 May 2005 a Astronomical Institute, Utrecht University, Princetonplein
More informationMacroscopic plasma description
Macroscopic plasma description Macroscopic plasma theories are fluid theories at different levels single fluid (magnetohydrodynamics MHD) two-fluid (multifluid, separate equations for electron and ion
More informationMHD Modes of Solar Plasma Structures
PX420 Solar MHD 2013-2014 MHD Modes of Solar Plasma Structures Centre for Fusion, Space & Astrophysics Wave and oscillatory processes in the solar corona: Possible relevance to coronal heating and solar
More information1 Energy dissipation in astrophysical plasmas
1 1 Energy dissipation in astrophysical plasmas The following presentation should give a summary of possible mechanisms, that can give rise to temperatures in astrophysical plasmas. It will be classified
More informationRecapitulation: Questions on Chaps. 1 and 2 #A
Recapitulation: Questions on Chaps. 1 and 2 #A Chapter 1. Introduction What is the importance of plasma physics? How are plasmas confined in the laboratory and in nature? Why are plasmas important in astrophysics?
More informationExact solutions for magnetic annihilation in curvilinear geometry
Exact solutions for magnetic annihilation in curvilinear geometry E. Tassi b,, V.S. Titov and G. Hornig Theoretische Physik IV, Ruhr-Universität Bochum, 44780 Bochum, Germany b Theoretische Physik IV,
More informationMHD Simulation of Solar Chromospheric Evaporation Jets in the Oblique Coronal Magnetic Field
MHD Simulation of Solar Chromospheric Evaporation Jets in the Oblique Coronal Magnetic Field Y. Matsui, T. Yokoyama, H. Hotta and T. Saito Department of Earth and Planetary Science, University of Tokyo,
More informationPrototype Instabilities
Prototype Instabilities David Randall Introduction Broadly speaking, a growing atmospheric disturbance can draw its kinetic energy from two possible sources: the kinetic and available potential energies
More informationMagnetohydrodynamic waves in a plasma
Department of Physics Seminar 1b Magnetohydrodynamic waves in a plasma Author: Janez Kokalj Advisor: prof. dr. Tomaž Gyergyek Petelinje, April 2016 Abstract Plasma can sustain different wave phenomena.
More informationGlobal existence for the ion dynamics in the Euler-Poisson equations
Global existence for the ion dynamics in the Euler-Poisson equations Yan Guo (Brown U), Benoît Pausader (Brown U). FRG Meeting May 2010 Abstract We prove global existence for solutions of the Euler-Poisson/Ion
More information3 Hydrostatic Equilibrium
3 Hydrostatic Equilibrium Reading: Shu, ch 5, ch 8 31 Timescales and Quasi-Hydrostatic Equilibrium Consider a gas obeying the Euler equations: Dρ Dt = ρ u, D u Dt = g 1 ρ P, Dɛ Dt = P ρ u + Γ Λ ρ Suppose
More informationGlobal Magnetorotational Instability with Inflow
Global Magnetorotational Instability with Inflow Evy Kersalé PPARC Postdoctoral Research Associate Dept. of Appl. Maths University of Leeds Collaboration: D. Hughes & S. Tobias (Appl. Maths, Leeds) N.
More informationEquations of linear stellar oscillations
Chapter 4 Equations of linear stellar oscillations In the present chapter the equations governing small oscillations around a spherical equilibrium state are derived. The general equations were presented
More informationReduced MHD. Nick Murphy. Harvard-Smithsonian Center for Astrophysics. Astronomy 253: Plasma Astrophysics. February 19, 2014
Reduced MHD Nick Murphy Harvard-Smithsonian Center for Astrophysics Astronomy 253: Plasma Astrophysics February 19, 2014 These lecture notes are largely based on Lectures in Magnetohydrodynamics by Dalton
More information20. Alfven waves. ([3], p ; [1], p ; Chen, Sec.4.18, p ) We have considered two types of waves in plasma:
Phys780: Plasma Physics Lecture 20. Alfven Waves. 1 20. Alfven waves ([3], p.233-239; [1], p.202-237; Chen, Sec.4.18, p.136-144) We have considered two types of waves in plasma: 1. electrostatic Langmuir
More informationMagnetic reconnection in coronal plasmas
UW, 28 May, 2010 p.1/17 Magnetic reconnection in coronal plasmas I.J.D Craig Department of Mathematics University of Waikato Hamilton New Zealand UW, 28 May, 2010 p.2/17 Why reconnection? Reconnection
More informationChapter 1. Introduction to Nonlinear Space Plasma Physics
Chapter 1. Introduction to Nonlinear Space Plasma Physics The goal of this course, Nonlinear Space Plasma Physics, is to explore the formation, evolution, propagation, and characteristics of the large
More informationSW103: Lecture 2. Magnetohydrodynamics and MHD models
SW103: Lecture 2 Magnetohydrodynamics and MHD models Scale sizes in the Solar Terrestrial System: or why we use MagnetoHydroDynamics Sun-Earth distance = 1 Astronomical Unit (AU) 200 R Sun 20,000 R E 1
More informationAnalysis of Jeans Instability of Partially-Ionized. Molecular Cloud under Influence of Radiative. Effect and Electron Inertia
Adv. Studies Theor. Phys., Vol. 5, 2011, no. 16, 755-764 Analysis of Jeans Instability of Partially-Ionized Molecular Cloud under Influence of Radiative Effect and Electron Inertia B. K. Dangarh Department
More informationGas Dynamics: Basic Equations, Waves and Shocks
Astrophysical Dynamics, VT 010 Gas Dynamics: Basic Equations, Waves and Shocks Susanne Höfner Susanne.Hoefner@fysast.uu.se Astrophysical Dynamics, VT 010 Gas Dynamics: Basic Equations, Waves and Shocks
More informationFluctuation dynamo amplified by intermittent shear bursts
by intermittent Thanks to my collaborators: A. Busse (U. Glasgow), W.-C. Müller (TU Berlin) Dynamics Days Europe 8-12 September 2014 Mini-symposium on Nonlinear Problems in Plasma Astrophysics Introduction
More informationReconstructing Force-Free Fields by a Lagrange Multiplier Technique
Reconstructing Force-Free Fields by a Lagrange Multiplier Technique S. Nasiri In collaboration with T. Wiegelmann and B. Inhester MPS Solar Group Seminar June 18, 2013 Contents Force free modeling for
More informationNatalia Tronko S.V.Nazarenko S. Galtier
IPP Garching, ESF Exploratory Workshop Natalia Tronko University of York, York Plasma Institute In collaboration with S.V.Nazarenko University of Warwick S. Galtier University of Paris XI Outline Motivations:
More informationProf. dr. A. Achterberg, Astronomical Dept., IMAPP, Radboud Universiteit
Prof. dr. A. Achterberg, Astronomical Dept., IMAPP, Radboud Universiteit Rough breakdown of MHD shocks Jump conditions: flux in = flux out mass flux: ρv n magnetic flux: B n Normal momentum flux: ρv n
More informationThe Euler Equation of Gas-Dynamics
The Euler Equation of Gas-Dynamics A. Mignone October 24, 217 In this lecture we study some properties of the Euler equations of gasdynamics, + (u) = ( ) u + u u + p = a p + u p + γp u = where, p and u
More informationMAGNETIC NOZZLE PLASMA EXHAUST SIMULATION FOR THE VASIMR ADVANCED PROPULSION CONCEPT
MAGNETIC NOZZLE PLASMA EXHAUST SIMULATION FOR THE VASIMR ADVANCED PROPULSION CONCEPT ABSTRACT A. G. Tarditi and J. V. Shebalin Advanced Space Propulsion Laboratory NASA Johnson Space Center Houston, TX
More information6 Parametric oscillator
6 Parametric oscillator 6. Mathieu equation We now study a different kind of forced pendulum. Specifically, imagine subjecting the pivot of a simple frictionless pendulum to an alternating vertical motion:
More informationPlasmas as fluids. S.M.Lea. January 2007
Plasmas as fluids S.M.Lea January 2007 So far we have considered a plasma as a set of non intereacting particles, each following its own path in the electric and magnetic fields. Now we want to consider
More informationA Lagrangian approach to the study of the kinematic dynamo
1 A Lagrangian approach to the study of the kinematic dynamo Jean-Luc Thiffeault Department of Applied Physics and Applied Mathematics Columbia University http://plasma.ap.columbia.edu/~jeanluc/ October
More informationModelling the Initiation of Solar Eruptions. Tibor Török. LESIA, Paris Observatory, France
Modelling the Initiation of Solar Eruptions Tibor Török LESIA, Paris Observatory, France What I will not talk about: global CME models Roussev et al., 2004 Manchester et al., 2004 Tóth et al., 2007 numerical
More informationFinite-time singularity formation at a magnetic neutral line in Hall magnetohydrodynamics
Finite-time singularity formation at a magnetic neutral line in Hall magnetohydrodynamics Yuri E. Litvinenko, Liam C. McMahon Department of Mathematics, University of Waikato, P. B. 3105, Hamilton, New
More informationA Comparison between the Two-fluid Plasma Model and Hall-MHD for Captured Physics and Computational Effort 1
A Comparison between the Two-fluid Plasma Model and Hall-MHD for Captured Physics and Computational Effort 1 B. Srinivasan 2, U. Shumlak Aerospace and Energetics Research Program University of Washington,
More informationVarious lecture notes for
Various lecture notes for 18311. R. R. Rosales (MIT, Math. Dept., 2-337) April 12, 2013 Abstract Notes, both complete and/or incomplete, for MIT s 18.311 (Principles of Applied Mathematics). These notes
More informationMagnetic Reconnection: Recent Developments and Future Challenges
Magnetic Reconnection: Recent Developments and Future Challenges A. Bhattacharjee Center for Integrated Computation and Analysis of Reconnection and Turbulence (CICART) Space Science Center, University
More informationDispersive Media, Lecture 7 - Thomas Johnson 1. Waves in plasmas. T. Johnson
2017-02-14 Dispersive Media, Lecture 7 - Thomas Johnson 1 Waves in plasmas T. Johnson Introduction to plasmas as a coupled system Magneto-Hydro Dynamics, MHD Plasmas without magnetic fields Cold plasmas
More informationJet Stability: A computational survey
Jet Stability Galway 2008-1 Jet Stability: A computational survey Rony Keppens Centre for Plasma-Astrophysics, K.U.Leuven (Belgium) & FOM-Institute for Plasma Physics Rijnhuizen & Astronomical Institute,
More informationThe Virial Theorem, MHD Equilibria, and Force-Free Fields
The Virial Theorem, MHD Equilibria, and Force-Free Fields Nick Murphy Harvard-Smithsonian Center for Astrophysics Astronomy 253: Plasma Astrophysics February 10 12, 2014 These lecture notes are largely
More informationA theory for localized low-frequency ideal MHD modes in axisymmetric toroidal systems is generalized to take into account both toroidal and poloidal
MHD spectra pre-history (selected results I MHD spectra pre-history (selected results II Abstract A theory for localized low-frequency ideal MHD modes in axisymmetric toroidal systems is generalized to
More informationResults on the classical high-! bar-mode instability in relativistic star models for polytropic EoS with adiabatic index!=2.75.
Results on the classical high-! bar-mode instability in relativistic star models for polytropic EoS with adiabatic index!=2.75 Luca Franci (1) in collaboration with Roberto De Pietri (1), Alessandra Feo
More informationChapter 2. General concepts. 2.1 The Navier-Stokes equations
Chapter 2 General concepts 2.1 The Navier-Stokes equations The Navier-Stokes equations model the fluid mechanics. This set of differential equations describes the motion of a fluid. In the present work
More informationMagnetohydrodynamics (MHD)
Magnetohydrodynamics (MHD) Robertus v F-S Robertus@sheffield.ac.uk SP RC, School of Mathematics & Statistics, The (UK) The Outline Introduction Magnetic Sun MHD equations Potential and force-free fields
More information0 Magnetically Confined Plasma
0 Magnetically Confined Plasma 0.1 Particle Motion in Prescribed Fields The equation of motion for species s (= e, i) is written as d v ( s m s dt = q s E + vs B). The motion in a constant magnetic field
More informationKinetic Alfvén waves in space plasmas
Kinetic Alfvén waves in space plasmas Yuriy Voitenko Belgian Institute for Space Aeronomy, Brussels, Belgium Solar-Terrestrial Center of Excellence, Space Pole, Belgium Recent results obtained in collaboration
More informationHeliophysics Shocks. Merav Opher, George Mason University,
Heliophysics Shocks QuickTime and a TIFF (Uncompressed) decompressor are needed to see this picture. Merav Opher, George Mason University, mopher@gmu.edu Heliophysics Summer School, July 25, 2008 Outline
More informationLinear and Nonlinear Oscillators (Lecture 2)
Linear and Nonlinear Oscillators (Lecture 2) January 25, 2016 7/441 Lecture outline A simple model of a linear oscillator lies in the foundation of many physical phenomena in accelerator dynamics. A typical
More informationWKB Approximation of the Nonlinear Schrödinger-Newton Equations
WKB Approximation of the Nonlinear Schrödinger-Newton Equations Carsten Hartmann and Heinz-Jürgen Schmidt Free University Berlin, Institute of Mathematics II Arnimallee 2-6, 14195 Berlin-Dahlem, Germany
More informationA Study of 3-Dimensional Plasma Configurations using the Two-Fluid Plasma Model
A Study of 3-Dimensional Plasma Configurations using the Two-Fluid Plasma Model B. Srinivasan, U. Shumlak Aerospace and Energetics Research Program University of Washington IEEE International Conference
More informationIdeal Magnetohydrodynamics (MHD)
Ideal Magnetohydrodynamics (MHD) Nick Murphy Harvard-Smithsonian Center for Astrophysics Astronomy 253: Plasma Astrophysics February 1, 2016 These lecture notes are largely based on Lectures in Magnetohydrodynamics
More informationwhere G is Newton s gravitational constant, M is the mass internal to radius r, and Ω 0 is the
Homework Exercise Solar Convection and the Solar Dynamo Mark Miesch (HAO/NCAR) NASA Heliophysics Summer School Boulder, Colorado, July 27 - August 3, 2011 PROBLEM 1: THERMAL WIND BALANCE We begin with
More information4 Results of the static and dynamic light scattering measurements
4 Results of the static and dynamic light scattering measurements 4 Results of the static and dynamic light scattering measurements In this section we present results of statistic and dynamic light scattering
More informationSelf-organization of Reconnecting Plasmas to a Marginally Collisionless State. Shinsuke Imada (Nagoya Univ., STEL)
Self-organization of Reconnecting Plasmas to a Marginally Collisionless State Shinsuke Imada (Nagoya Univ., STEL) Introduction The role of Magnetic reconnection Solar Flare Coronal heating, micro/nano-flare
More informationGyrokinetic simulations of magnetic fusion plasmas
Gyrokinetic simulations of magnetic fusion plasmas Tutorial 2 Virginie Grandgirard CEA/DSM/IRFM, Association Euratom-CEA, Cadarache, 13108 St Paul-lez-Durance, France. email: virginie.grandgirard@cea.fr
More informationIntroduction to Magnetohydrodynamics (MHD)
Introduction to Magnetohydrodynamics (MHD) Tony Arber University of Warwick 4th SOLARNET Summer School on Solar MHD and Reconnection Aim Derivation of MHD equations from conservation laws Quasi-neutrality
More informationGyrokinetic Simulations of Tearing Instability
Gyrokinetic Simulations of Tearing Instability July 6, 2009 R. NUMATA A,, W. Dorland A, N. F. Loureiro B, B. N. Rogers C, A. A. Schekochihin D, T. Tatsuno A rnumata@umd.edu A) Center for Multiscale Plasma
More informationExponential Decay: From Semi-Global to Global
Exponential Decay: From Semi-Global to Global Martin Gugat Benasque 2013 Martin Gugat (FAU) From semi-global to global. 1 / 13 How to get solutions that are global in time? 1 Sometimes, the semiglobal
More informationThe model of solar wind polytropic flow patterns
The model of solar wind polytropic flow patterns work in progress B.M. Shergelashvili in collaboration with V. N. Melnik, G. Dididze, H. Fichtner, S. Poedts, T. V. Zaqarashvili, M. L. Khodachenko Our Mysterious
More informationWorkshop on PDEs in Fluid Dynamics. Department of Mathematics, University of Pittsburgh. November 3-5, Program
Workshop on PDEs in Fluid Dynamics Department of Mathematics, University of Pittsburgh November 3-5, 2017 Program All talks are in Thackerary Hall 704 in the Department of Mathematics, Pittsburgh, PA 15260.
More informationWaves in plasma. Denis Gialis
Waves in plasma Denis Gialis This is a short introduction on waves in a non-relativistic plasma. We will consider a plasma of electrons and protons which is fully ionized, nonrelativistic and homogeneous.
More informationMHD modeling of the kink double-gradient branch of the ballooning instability in the magnetotail
MHD modeling of the kink double-gradient branch of the ballooning instability in the magnetotail Korovinskiy 1 D., Divin A., Ivanova 3 V., Erkaev 4,5 N., Semenov 6 V., Ivanov 7 I., Biernat 1,8 H., Lapenta
More informationASTR-3760: Solar & Space Physics...Spring 2017
ASTR-3760: Solar & Space Physics...Spring 2017 Review material for midterm exam (March 22, 2017) Although I m not recommending full-on memorization of everything in this document, I do think it s important
More information2/8/16 Dispersive Media, Lecture 5 - Thomas Johnson 1. Waves in plasmas. T. Johnson
2/8/16 Dispersive Media, Lecture 5 - Thomas Johnson 1 Waves in plasmas T. Johnson Introduction to plasma physics Magneto-Hydro Dynamics, MHD Plasmas without magnetic fields Cold plasmas Transverse waves
More informationQuasi-neutral limit for Euler-Poisson system in the presence of plasma sheaths
in the presence of plasma sheaths Department of Mathematical Sciences Ulsan National Institute of Science and Technology (UNIST) joint work with Masahiro Suzuki (Nagoya) and Chang-Yeol Jung (Ulsan) The
More informationCurrent-driven instabilities
Current-driven instabilities Ben Dudson Department of Physics, University of York, Heslington, York YO10 5DD, UK 21 st February 2014 Ben Dudson Magnetic Confinement Fusion (1 of 23) Previously In the last
More informationAYA Oscillations in Solar Coronal Magnetic Structures
AYA2003-00123 Oscillations in Solar Coronal Magnetic Structures P. I.: J. L. Ballester (Staff) R. Oliver (Staff) Department of Physics M. Carbonell (Staff) University of the J. Terradas (J. De la Cierva)
More informationCHAPTER 16. Hydrostatic Equilibrium & Stellar Structure
CHAPTER 16 Hydrostatic Equilibrium & Stellar Structure Hydrostatic Equilibrium: A fluid is said to be in hydrostatic equilibrium (HE) when it is at rest. This occurs when external forces such as gravity
More informationMAE210C: Fluid Mechanics III Spring Quarter sgls/mae210c 2013/ Solution II
MAE210C: Fluid Mechanics III Spring Quarter 2013 http://web.eng.ucsd.edu/ sgls/mae210c 2013/ Solution II D 4.1 The equations are exactly the same as before, with the difference that the pressure in the
More informationLesson 3: MHD reconnec.on, MHD currents
Lesson3:MHDreconnec.on, MHDcurrents AGF 351 Op.calmethodsinauroralphysicsresearch UNIS,24. 25.11.2011 AnitaAikio UniversityofOulu Finland Photo:J.Jussila MHDbasics MHD cannot address discrete or single
More informationTwo Fluid Dynamo and Edge-Resonant m=0 Tearing Instability in Reversed Field Pinch
1 Two Fluid Dynamo and Edge-Resonant m= Tearing Instability in Reversed Field Pinch V.V. Mirnov 1), C.C.Hegna 1), S.C. Prager 1), C.R.Sovinec 1), and H.Tian 1) 1) The University of Wisconsin-Madison, Madison,
More informationMagnetic Reconnection in Laboratory, Astrophysical, and Space Plasmas
Magnetic Reconnection in Laboratory, Astrophysical, and Space Plasmas Nick Murphy Harvard-Smithsonian Center for Astrophysics namurphy@cfa.harvard.edu http://www.cfa.harvard.edu/ namurphy/ November 18,
More informationSpace Plasma Physics Thomas Wiegelmann, 2012
Space Plasma Physics Thomas Wiegelmann, 2012 1. Basic Plasma Physics concepts 2. Overview about solar system plasmas Plasma Models 3. Single particle motion, Test particle model 4. Statistic description
More informationMHD SIMULATIONS IN PLASMA PHYSICS
MHD SIMULATIONS IN PLASMA PHYSICS P. Jelínek 1,2, M. Bárta 3 1 University of South Bohemia, Department of Physics, Jeronýmova 10, 371 15 České Budějovice 2 Charles University, Faculty of Mathematics and
More informationStellar Winds. Star. v w
Stellar Winds Star v w Stellar Winds Geoffrey V. Bicknell 1 Characteristics of stellar winds Solar wind Velocity at earth s orbit: Density: Temperature: Speed of sound: v 400 km/s n 10 7 m 3 c s T 10 5
More information2:2:1 Resonance in the Quasiperiodic Mathieu Equation
Nonlinear Dynamics 31: 367 374, 003. 003 Kluwer Academic Publishers. Printed in the Netherlands. ::1 Resonance in the Quasiperiodic Mathieu Equation RICHARD RAND Department of Theoretical and Applied Mechanics,
More informationLinear stability of MHD configurations
Linear stability of MHD configurations Rony Keppens Centre for mathematical Plasma Astrophysics KU Leuven Rony Keppens (KU Leuven) Linear MHD stability CHARM@ROB 2017 1 / 18 Ideal MHD configurations Interested
More informationConvection. If luminosity is transported by radiation, then it must obey
Convection If luminosity is transported by radiation, then it must obey L r = 16πacr 2 T 3 3ρκ R In a steady state, the energy transported per time at radius r must be equal to the energy generation rate
More informationMHD Simulation of Solar Flare Current Sheet Position and Comparison with X-ray Observations in active region NOAA 10365
Sun and Geosphere, 2013; 8(2):71-76 ISSN 1819-0839 MHD Simulation of Solar Flare Current Sheet Position and Comparison with X-ray Observations in active region NOAA 10365 A. I. Podgorny 1, I. M. Podgorny
More informationChapter 1. Governing Equations of GFD. 1.1 Mass continuity
Chapter 1 Governing Equations of GFD The fluid dynamical governing equations consist of an equation for mass continuity, one for the momentum budget, and one or more additional equations to account for
More informationAMSC 663 Project Proposal: Upgrade to the GSP Gyrokinetic Code
AMSC 663 Project Proposal: Upgrade to the GSP Gyrokinetic Code George Wilkie (gwilkie@umd.edu) Supervisor: William Dorland (bdorland@umd.edu) October 11, 2011 Abstract Simulations of turbulent plasma in
More informationChap. 1 Fundamental Concepts
NE 2 Chap. 1 Fundamental Concepts Important Laws in Electromagnetics Coulomb s Law (1785) Gauss s Law (1839) Ampere s Law (1827) Ohm s Law (1827) Kirchhoff s Law (1845) Biot-Savart Law (1820) Faradays
More informationarxiv: v4 [physics.comp-ph] 21 Jan 2019
A spectral/hp element MHD solver Alexander V. Proskurin,Anatoly M. Sagalakov 2 Altai State Technical University, 65638, Russian Federation, Barnaul, Lenin prospect,46, k2@list.ru 2 Altai State University,
More informationVariability of accreting black holes induced by shocks in low angular momentum flows
induced by shocks in low angular momentum flows Astronomical Institute of the CAS Prague, Czech Republic Cooperation with Agnieszka Janiuk, CFT PAN, Vladimír Karas ASU CAS 23.10.2017 Low angular momentum
More information13. REDUCED MHD. Since the magnetic field is almost uniform and uni-directional, the field has one almost uniform component ( B z
13. REDUCED MHD One often encounters situations in which the magnetic field is strong and almost unidirectional. Since a constant field does not produce a current density, these fields are sometimes said
More information13. ASTROPHYSICAL GAS DYNAMICS AND MHD Hydrodynamics
1 13. ASTROPHYSICAL GAS DYNAMICS AND MHD 13.1. Hydrodynamics Astrophysical fluids are complex, with a number of different components: neutral atoms and molecules, ions, dust grains (often charged), and
More informationChapter 4. MHD Equilibrium and Stability. 4.1 Basic Two-Dimensional Equilibrium Equations and Properties. Resistive Diffusion
Chapter 4 MHD Equilibrium and Stability Resistive Diffusion Before discussing equilibrium properties let us first consider effects of electric resistivity. Using the resistive form of Ohm s law with constant
More informationEAS372 Open Book Final Exam 11 April, 2013
EAS372 Open Book Final Exam 11 April, 2013 Professor: J.D. Wilson Time available: 2 hours Value: 30% Please check the Terminology, Equations and Data section before beginning your responses. Answer all
More informationTheory of bifurcation amplifiers utilizing the nonlinear dynamical response of an optically damped mechanical oscillator
Theory of bifurcation amplifiers utilizing the nonlinear dynamical response of an optically damped mechanical oscillator Research on optomechanical systems is of relevance to gravitational wave detection
More informationScaling of Magnetic Reconnection in Collisional and Kinetic Regimes
Scaling of Magnetic Reconnection in Collisional and Kinetic Regimes William Daughton Los Alamos National Laboratory Collaborators: Vadim Roytershteyn, Brian Albright H. Karimabadi, Lin Yin & Kevin Bowers
More informationI. INTRODUCTION AND HISTORICAL PERSPECTIVE
I. INTRODUCTION AND HISTORICAL PERSPECTIVE A. Failures of Classical Physics At the end of the 19th century, physics was described via two main approaches. Matter was described by Newton s laws while radiation
More informationIntroduction to a few basic concepts in thermoelectricity
Introduction to a few basic concepts in thermoelectricity Giuliano Benenti Center for Nonlinear and Complex Systems Univ. Insubria, Como, Italy 1 Irreversible thermodynamic Irreversible thermodynamics
More informationNONLINEAR MHD WAVES THE INTERESTING INFLUENCE OF FIREHOSE AND MIRROR IN ASTROPHYSICAL PLASMAS. Jono Squire (Caltech) UCLA April 2017
NONLINEAR MHD WAVES THE INTERESTING INFLUENCE OF FIREHOSE AND MIRROR IN ASTROPHYSICAL PLASMAS Jono Squire (Caltech) UCLA April 2017 Along with: E. Quataert, A. Schekochihin, M. Kunz, S. Bale, C. Chen,
More informationNon-linear MHD Simulations of Edge Localized Modes in ASDEX Upgrade. Matthias Hölzl, Isabel Krebs, Karl Lackner, Sibylle Günter
Non-linear MHD Simulations of Edge Localized Modes in ASDEX Upgrade Matthias Hölzl, Isabel Krebs, Karl Lackner, Sibylle Günter Matthias Hölzl Nonlinear ELM Simulations DPG Spring Meeting, Jena, 02/2013
More informationPlasma Astrophysics Chapter 1: Basic Concepts of Plasma. Yosuke Mizuno Institute of Astronomy National Tsing-Hua University
Plasma Astrophysics Chapter 1: Basic Concepts of Plasma Yosuke Mizuno Institute of Astronomy National Tsing-Hua University What is a Plasma? A plasma is a quasi-neutral gas consisting of positive and negative
More informationNon equilibrium thermodynamic transformations. Giovanni Jona-Lasinio
Non equilibrium thermodynamic transformations Giovanni Jona-Lasinio Kyoto, July 29, 2013 1. PRELIMINARIES 2. RARE FLUCTUATIONS 3. THERMODYNAMIC TRANSFORMATIONS 1. PRELIMINARIES Over the last ten years,
More informationDYNAMO THEORY: THE PROBLEM OF THE GEODYNAMO PRESENTED BY: RAMANDEEP GILL
DYNAMO THEORY: THE PROBLEM OF THE GEODYNAMO PRESENTED BY: RAMANDEEP GILL MAGNETIC FIELD OF THE EARTH DIPOLE Field Structure Permanent magnetization of Core? 80% of field is dipole 20 % is non dipole 2)
More informationGinzburg-Landau length scales
597 Lecture 6. Ginzburg-Landau length scales This lecture begins to apply the G-L free energy when the fields are varying in space, but static in time hence a mechanical equilibrium). Thus, we will be
More informationTarget Simulations. Roman Samulyak in collaboration with Y. Prykarpatskyy, T. Lu
Muon Collider/Neutrino Factory Collaboration Meeting May 26 28, CERN, Geneva U.S. Department of Energy Target Simulations Roman Samulyak in collaboration with Y. Prykarpatskyy, T. Lu Center for Data Intensive
More informationPhysical mechanism of spontaneous fast reconnection evolution
Earth Planets Space, 53, 431 437, 2001 Physical mechanism of spontaneous fast reconnection evolution M. Ugai Department of Computer Science, Faculty of Engineering, Ehime University, Matsuyama 790-8577,
More informationTURBULENT TRANSPORT THEORY
ASDEX Upgrade Max-Planck-Institut für Plasmaphysik TURBULENT TRANSPORT THEORY C. Angioni GYRO, J. Candy and R.E. Waltz, GA The problem of Transport Transport is the physics subject which studies the physical
More information