Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1700p&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1700
Physics
2407 Auroral Ionosphere (2704), 2740 Magnetospheric Configuration And Dynamics, 2790 Substorms, 7827 Kinetic And Mhd Theory
Scientific paper
Observations show that Pi 2 waves are excited prior to the appearance of breakup auroral arcs that break up after substorm expansion onset. The Pi2 waves and the breakup arcs are modeled by the Kinetic Ballooning Instability (KBI), which is destabilized by plasma pressure gradient and magnetic field curvature in the high beta magnetic well region in the near-Earth plasma sheet. Our model is based on the theoretical analysis and numerical solutions of the gyrokinetic mode equations for late growth phase 3D magnetospheric equilibria. The results show that the KBI has a real frequency associated with the ion magnetic drift frequency, which is in the Pi2 frequency range, and the most unstable KBI has an azimuthal mode number on the order of 200- 300. The theoretical KBI features are consistent with observational features in both the aurora breakup arcs and the near-Earth plasma sheet. Comparison between our KBI model and substorm breakup arc observations by FORMOSAT-2's ISUAL and THEMIS All Sky Imagers will be presented.
Chang Tsao
Cheng Chung-Chieh
Gorelenkov Nikolai
Peng Amy
Zaharia Sorin
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