Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41b1712c&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM41B-1712
Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2744] Magnetospheric Physics / Magnetotail, [2774] Magnetospheric Physics / Radiation Belts, [2790] Magnetospheric Physics / Substorms
Scientific paper
We investigate the origin of waves leading to current disruption and dipolarization observed by THEMIS satellites in the near-Earth plasma sheet near substorm expansion onset events on 29 January 2008. Based on the Hilbert-Huang Transform (HHT) technique we analyze the magnetic activity associated with current disruption which shows clearly low frequency fluctuations in the Pi 2 range growing exponentially before the time of magnetic field depolarization and continuing well into the expansion phase. Higher frequency waves are excited at or after the depolarization process starts. These features of magnetic activities are present in almost all three substorm events on January 29, 2008. We identify the low frequency instability as the kinetic ballooning modes destabilized by the free energy associated with the plasma pressure gradient in the bad magnetic field curvature via the wave-particle magnetic drift resonance effect.
Chang Tsao
Cheng C. Z.
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