Possibility of an Alfvenic Wave Resonator in the Magnetosphere*

Details Possibility of an Alfvenic Wave Resonator in the Magnetosphere* Possibility of an Alfvenic Wave Resonator in the Magnetosphere*

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm33a0433m&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM33A-0433

Physics

2720 Energetic Particles: Trapped, 2772 Plasma Waves And Instabilities (2471), 2788 Magnetic Storms And Substorms (7954), 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)

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. * Work supported by ONR 1 Mithaiwala, M.J. and W. Horton. JGR 110. July 2005. 2 Ganguli, G. and L. Rudakov. Phys. Plasmas 12. April 2005.

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