Generation Mechanism of Whistler-mode Chorus Emissions
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1 Generation Mechanism of Whistler-mode Chorus Emissions Yoshiharu Omura Research Institute for Sustainable Humanosphere, Kyoto University, Kyoto, Japan 5th East-Asia School and Workshop on Laboratory, Space, Astrophysical Plasmas, August 20, 2015, Pohan, Korea
2 Geospace Radiation Belts
3 Motion of Charged Particles in Dipole Magnetic Field
4 Van Allen Probes (2 satellites) Cluster Mission (4 satellites) NASA ESA
5 Chorus Emission due to Injection of Energetic Electrons Cluster observation [Santolik, Gurnett, Pickett, Parrot, Cornilleau-Wehrlin, JGR, 2003]
6 [Kletzing, 2014] sum of the power-spectral densities of magnetic components ellipticity of the magnetic field polarization planarity of the magnetic field polarization angle between the wave vector and the background magnetic field Wave Observation, Van Allen Probe B, 2 July 2014
7 [Kletzing, 2014] sum of the power-spectral densities of magnetic components ellipticity of the magnetic field polarization planarity of the magnetic field polarization angle between the wave vector and the background magnetic field Wave Observation, Van Allen Probe A, 14 April 2014
8 [Kletzing, 2014] sum of the power-spectral densities of magnetic components ellipticity of the magnetic field polarization planarity of the magnetic field polarization angle between the wave vector and the background magnetic field Wave Observation, Van Allen Probe A, 8 June 2014
9 sum of the power-spectral densities of magnetic components ellipticity of the magnetic field polarization planarity of the magnetic field polarization Wave Observation, Van Allen Probe A, 14 Nov 2012 angle between the wave vector and the background magnetic field [Santolik et al. GRL 2014]
10 Whistler-mode Triggered Emissions EMIC Triggered Emissions [Kimura et al., JGG, 1990] [Pickett et al., GRL, 2010]
11 Wave-Particle Interactions in Earth s Inner Magnetosphere [Summers et al., JGR, 1998]
12 Test Particle Simulation of Nonlinear Wave Trapping and Acceleration of Trapped Particles ( kev) Wave Electrons [ Omura and Summers, JGR, 2006 ]
13 Nonlinear Dynamics of Resonant Electrons Inhomogeneity Factor [Omura et al., JGR, 2008]
14
15
16 Wave Equations J E > 0 J E < 0
17
18 Nonlinear Wave Growth due to Formation of Electromagnetic Electron Hole Maximum -J E [Omura et al., JGR, 2008]
19 Frequency Sweep Rate Dependence on Wave Amplitude at Equator, which is controlled by Energetic Electron Density [Katoh and Omura, 2011]
20 Electron Hole for Nonlinear Wave Growth [Hikishima and Omura, JGR, 2012]
21 Rising-Tone Emissions Triggered by Waves with Different Amplitudes [Hikishima and Omura, JGR 2012]
22 Linear Dispersion Relation Nonlinear Dispersion Relation Assuming Nonlinear Frequency Shift where ( > 0 : Electron Hole) Optimum Wave Growth Condition Nonlinear Transition Time
23 Optimum Wave Amplitude and Threshold Amplitude Electron Hybrid Simulation [Katoh and Omura, 2007]
24 Nonlinear Wave Growth through Propagation : Convective Instability Equator Self-sustaining Mechanism h
25 Optimum Amplitude Threshold Amplitude [Kurita et al., JGR, 2012 ]
26 Simulations : parallel propagation Observations: oblique propagation [Omura et al., JGR, 2008 ] [Hikishima et al., JGR, 2009 ] [Santolik, et al., JGR, 2003 ] [Hosphodarsky et al., JGR, 2008 ]
27 Quasi-parallel Propagation (Oblique) : Wavenormal Angle With
28 Nonlinear Resonant Damping in the dipole magnetic field Wave Damping [Omura et al., JGR, 2009]
29
30 [Yagitani et al., JGR, 2014]
31 [Yagitani et al., JGR, 2014]
32
33 Formation of Electron Hole and Bump [Hikishima et al., JGR, 2010 ]
34
35 EMIC Rising-tone Emissions Nonlinear Wave Growth Theory [Pickett et al., GRL, 2010] Hybrid Code Simulations [Omura et al.,jgr, 2010 ] [Shoji and Omura, JGR, 2011,2012, 2013,2014 ] Radiation Belt Slot Region Outside Plasmapause Akebono [Sakaguchi et al.,grl, 2013 ] [Nakamura et al., JGR, 2014]
36 EMIC Rising Tone Emissions with Sub-packets [Shoji and Omura, JGR, 2013] 36
37 Nonlinear Wave Growth near Equator Equator h Electron Hill for Falling Tone Electron Hole for Rising Tone S > 0 S < 0 [Nunn and Omura, JGR, 2012; Omura, Nunn, Summers, AGU Monograph, 2012]
38 Summary Absolute Instability: Rising Tone: Electron Hole Falling Tone: Electron Hill Optimum Amplitude Sub-packet Formation Convective Instability Gap at Half Cyclotron Frequency [Santolik et al., GRL, 2014]
39 Review Articles Y. Omura, D. Nunn, and D. Summers, Generation processes of whistler-mode chorus emissions: Current status of nonlinear wave growth theory, AGU Monograph "Dynamics of the Earth's Radiation Belts and Inner Magnetosphere", /2012GM001347, Y. Omura, Theory and simulations of nonlinear wave-particle interactions in planetary radiation belts, Radio Science Bulletin, No. 349 (June) 52-58, 2014.
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