Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aps..dppkp1101m&link_type=abstract
American Physical Society, 47th Annual DPP Meeting, October 24-28, 2005, abstract #KP1.101
Physics
Scientific paper
There has been recent activity in understanding the origin of high energy (>1 MeV) ``killer electrons'' in the Earth's magnetosphere. Previous work has identified the energization mechanism to be quasilinear diffusion involving whistler and ion-cyclotron waves, which are generated by temperature anisotropy. It is known that whistler waves, through reflection at the lower-hybrid resonance, can form a resonator. We find that in a multi-ion species environment, such as the Earth's magnetosphere, the bi-ion rotation (cutoff) frequency and Buchsbaum (resonance) frequency are important for the propagation and evolution of Alfvenic waves near the ion-cyclotron frequency. Here we show that Alfvenic waves with (k>> kz) can be captured by a magnetic cavity to form a strongly localized Magnetospheric Resonator which can interact with the electrons over a long time period and can lead to both energization and loss of the electrons. The Alfvenic waves can be generated by a ring distribution of one of the ion species. Ring ion distributions are known to form when the solar wind interacts with the magnetosphere or a comet interacts with the solar wind, and by the release of chemicals in the magnetosphere.
Ganguli Gurudas
Mithaiwala Manish
Rudakov Leonid
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