Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0586h&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0586
Other
2483 Wave/Particle Interactions
Scientific paper
Substorm-Related chorus events (SCE), VLF emissions with upper and lower cutoff frequencies increasing over time scales 10 min, have been identified in data from the SANAE base in Antarctica. These emissions, occurring predominantly in the midnight-dawn local time sector, have been shown to be a signature of the magnetospheric substorm expansion phase[1], and are thought to arise from cyclotron resonance between whistler mode waves and energetic particles injected around midnight. The guiding-center motion of the injected particles is influenced by energy-dependent azimuthal drift (due to the gradient and curvature in B) and energy-independent radial ExB drift. The results of simulations indicate that the relative importance of these two drifts in determining the temporal evolution of the SCE is local time dependent. These simulations also suggest that the model used to describe the pre-dawn SCE might be applicable to another class of VLF events observed mainly in the dawn-noon sector. References [1] A. J. Smith, M. P. Freeman, and G. D. Reeves. Postmidnight VLF chorus events, a substorm signature observed at the ground near L = 4. Journal of Geophysical Research, lOI(All):24641-24653, November 1996.
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