Living in a Star. Sarah Gibson (NCAR/HAO)
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1 Living in a Star Sarah Gibson (NCAR/HAO)
2 3D real-time astronomy Solar eruption (CME) Earth s magnetosphere We are observing a stellar system from within What we see may impact us in near-real time Unescapably three-dimensional Fundamentally magnetic
3 Weather as we usually think of it
4 All weather originates at the Sun Solar Structure: Core Where the energy is created. Nuclear reactions burn every second about 700 million tons of hydrogen into helium. Radiation Zone Where energy is transported by radiation. Although the photons travel at the speed of light, they bounce so many times through the dense material that they use about a million years to escape the Sun. Convection Zone Energy transported by convection (just like boiling soup) where heat is transported to the photosphere. Courtesy: SOHO (ESA/NASA)
5 The Sun at different temperatures/layers Observations from SOHO satellite (ESA/NASA)
6 Magnetic energy emerges through the solar surface (photosphere) (boxes are about the size of a sunspot) Hinode SOT: High resolution movies in G-band (430nm) and Ca II H (397nm) showing the motion of granules and small magnetic flux (NASA/JAXA)
7 but is trapped for a while in the solar corona Million Degrees Magnetically Dominated Expands to fill interplanetary space (NCAR/HAO)
8 Coronal structures storing magnetic energy may survive for days, weeks. (Just about anything on the Sun is quite dynamic when you look closely enough. However, on large-scale, structures pretty much stay put ) Hinode SOT (NASA/JAXA)
9 Magnetic fields organize coronal structure and drive coronal dynamics ( until they don t) TRACE 171 Angstroms NASA/Stanford-Lockheed Institute for Space Research EIT 195 Angstroms May 2, 1998 (ESA/NASA)
10 Solar activity - Flares RHESSI (NASA) and SOHO-EIT (ESA/NASA)
11 Space weather - Flares (JAXA/NASA) Flares represent transfer of magnetic energy to thermal/radiative energy. Flares affect the ionosphere and radio communication at the Earth. Flares also release energetic particles into space. Flares are not the whole story, though!
12 Solar activity - Coronal Mass Ejections HAO-MLSO (NCAR) SOHO-EIT (ESA/NASA) Not just hot stuff involved in solar dynamics (Relatively) cool/dense prominence mass may erupt Coronal mass ejections: CMEs
13 Space weather - CMEs SOHO-LASCO (ESA/NASA) CMEs represent transfer of magnetic energy into kinetic energy The interaction of CME and Earth magnetic fields may drive geomagnetic storms CMEs drive shock waves where energetic particles are accelerated CMEs are often associated with flares -- double whammy!
14 Magnetic fields are key! SOHO-MDI/TRACE NASA/Stanford-Lockheed Institute for Space Research
15 Modeling storage and release of magnetic energy: 3D and twisted SOHO-EIT (ESA/NASA) TRACE (NASA/Stanford- Lockheed Institute for Space Research) NCAR/HAO A range of observations suggest twisted magnetic configurations for CMEs and their precursors plasma and field are frozen together plasma structures trace out field
16 Modeling storage and release of magnetic energy: 3D and twisted What s a magnetic flux rope? Suggested definition: A set of magnetic field lines winding about an axial field line Loosely wound Tightly wound Spheromak-based Amari et al. (2003) Roussev (2003) (after Titov and Demoulin (1999)) After Gibson and Low (1998)
17 Modeling storage of magnetic energy As magnetic field is constantly inputted from below the solar surface, a flux rope forms and exists quiescently Fan and Gibson (2006)
18 Modeling release of magnetic energy Eventually, too much twisted flux emerges, and the rope undergoes the kink instability, and ruptures the overlying field in a coronal mass ejection Fan (2005)
19 Modeling impact of CME at the Earth Center for Space Environment Modeling (University of Michigan)
20 Modeling magnetospheric substorms at the Earth Opening with a view of the aurora borealis, we zoom out to reveal the orbital configuration of the five THEMIS satellites and fade in a GGCM magnetosphere model. (NASA)
21 Storage and release of magnetic energy is universal: laboratory and astrophysical plasmas Laboratory plasma (Bellan, CalTech)) BL Lacertae (Steffen, UNAM) SOHO/LASCO CME (NASA) Magnetic flux rope (Gibson and Fan, HAO/NCAR) EV Lacertae (Reed, NASA) Magnetic substorm model (GGCM/NASA) SOHO/EIT CME (NASA)
22 The 3D magnetized solar wind fills the solar system Color contours: solar wind speed Grey isosurface: Current sheet between positive and negative magnetic fields Solar wind model, Predictive Science Inc.
23 Conclusions We live in the outer atmosphere of a 3D, magnetic star The sun uniquely affects us, but we have unique views (up-close and 3D) of it Magnetic fields are the key to understanding, predicting, and mitigating space weather "If the sun didn't have a magnetic field, then it would be as boring a star as most astronomers think it is. (Leighton) Magnetic fields are to astrophysics what sex is to psychoanalysis (van de Hulst) Hinode SOT (NASA/JAXA)
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