Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm53b1389s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM53B-1389
Physics
Plasma Physics
[2728] Magnetospheric Physics / Magnetosheath, [2772] Magnetospheric Physics / Plasma Waves And Instabilities, [7839] Space Plasma Physics / Nonlinear Phenomena, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
The temperature anisotropy (T⊥/T|| >1) of ions in the magnetosheath drives the mirror and L-mode electromagnetic ion cyclotron instabilities. We performed three-dimensional (3D) hybrid simulations to study the competing process between these instabilities [Shoji et al., 2009]. We analyzed the mirror mode structures in the 3D model which are different from those in the 1D and 2D models. At the nonlinear stage of the mirror instability, coalescence of the mirror mode structures takes place. Through the nonlinear process, the scale size of the mirror mode structure in the transient coalescence of the 3D model (~ 40 ion inertial lengths) becomes in good agreement with planetary magnetosheath observations. Furthermore, we analyze the relation between the mirror instability and the magnetic peaks and decreases which are peculiar magnetic structures observed in the magnetosheath and the heliosheath. We performed parametric analyses of the 3D simulations to understand whether the mirror instability contributes to the magnetic peaks or decreases. We found that the magnetic peaks-like structures are constructed by the mirror instability in the nonlinear stage. In the nonlinear stage, protons in the mirror mode structure aggregate at localized regions, where the magnetic field becomes smaller because of the diamagnetism forming decrease-like structures. Reference: Shoji et al., Mirror Instability and L-mode Electromagnetic Ion Cyclotron Instability: Competition in the Earth's Magnetosheath, JGR, in press, 2009.
Omura Yuji
Shoji Masatoshi
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