Kinetic Ballooning Mode for Substorm Onset

Details Kinetic Ballooning Mode for Substorm Onset Kinetic Ballooning Mode for Substorm Onset

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm14a..07g&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM14A-07

Physics

7827 Kinetic And Mhd Theory, 2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 2788 Storms And Substorms

Scientific paper

AMPTE/CCE observations showed that the substorm onset in the near-Earth plasma sheet region ( ˜ 8-10 RE) is associated with a low frequency (in the Pi 2 range) instability that is excited 1-2 minutes before substorm onset. The instability has been explained as kinetic ballooning modes (KBMs) which are excited when β eq increases from ~ 20 to above 50. We present theoretical analysis and numerical solutions of KBMs by performing kinetic calculations which include kinetic effects of particle trapping, finite ion gyroradii, and wave-particle resonances. The global magnetosphere prior to substorm onset is modeled realistically by 3D quasi-static equilibrium solutions which consist of a current sheet with an enhanced cross-tail current density with thickness of ˜ 1 RE around the local midnight and with a longitudinal extent of ˜ 60-70o at X ˜ 7-10 RE. The associated ionospheric Birkeland current moves equatorward with an enhanced current density shrinking in latitudinal width, consistent with the observed ionospheric growth phase signatures. The KBM has a real frequency in the Pi2 frequency range. The results of kinetic calculations will be compared with the MHD theory.

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