Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23a1590m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM23A-1590
Physics
Plasma Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2790] Magnetospheric Physics / Substorms, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7859] Space Plasma Physics / Transport Processes
Scientific paper
We study a substorm chorus event observed at 1128 UT on 23 March 2007 in the ground-based observatories (P2 and South Pole) in Antarctica of the Polar Experiment Network for Geospace Upper-atmosphere INvestigations (PENGUIn). The locations of the two observatories are mapped out into the outer magnetosphere on the dawn side at the intervals of chorus observations. We examine whether or not the variations of the electron drift paths with pitch angles can lead to a condition favorable for generation of the chorus waves, namely temperature anisotropy, in the dawn side outer magnetosphere. Our study is based on a three dimensional electron test particle simulation using the TS05 magnetic field model. We first perform a backward tracing, and find that electrons with pitch angles of > 70 deg around the magnetic equator started drifting from relatively a small region confined near the geosynchronous orbit in the pre-midnight sector. On the other hand, electrons with pitch angles of < 30 deg started from a large area around the tail region. Assuming that the former represents the electron injection region, we carry out a forward tracing with several types of the initial pitch angle distribution. We find that a pancake-like pitch angle distribution is produced in the dawn side outer magnetosphere. Our results indicate that the chorus waves detected in the Antarctic ground-based observatories were generated due to the drift effect of the injected electrons.
Keika Kunihiro
Lee Julian
Min Kyoung
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