Kinetic Ballooning Instability for Substorm Onset

Details Kinetic Ballooning Instability for Substorm Onset Kinetic Ballooning Instability for Substorm Onset

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm61b05c&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM61B-05

Physics

2752 Mhd Waves And Instabilities, 2764 Plasma Sheet, 2788 Storms And Substorms, 7827 Kinetic And Mhd Theory, 7867 Wave/Particle Interactions

Scientific paper

AMPTE/CCE magnetic field data showed that a low frequency instability with a wave period of asbout 60 sec is observed near the end of the late growth phase before the substorm onset when the plasma β reaches to a high value larger than 50. The instability continues to evolve during the substorm expansion phase. It is clear that the low frequency instability is responsible for substorm onset and subsequent dipolarization through fast transport of plasma pressure in the near-Earth plasma sheet. To identify the nature of the low frequency instability, we propose a theory of kinetic ballooning instability which involves multiscale coupling of different spatial and temporal scales due to kinetic effects of finite ion Larmor radii and fast trapped electron dynamics. Numerical solutions of the kinetic ballooning instability will be presented.

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