Relativistic resonant acceleration of high energy electrons by a coherent whistler mode wave in the Earth's inner magnetosphere

Details Relativistic resonant acceleration of high energy electrons by a coherent whistler mode wave in the Earth's inner magnetosphere Relativistic resonant acceleration of high energy electrons by a coherent whistler mode wave in the Earth's inner magnetosphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm32a..06o&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM32A-06

Physics

2720 Energetic Particles: Trapped, 2730 Magnetosphere: Inner, 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471), 2774 Radiation Belts

Scientific paper

We report a very efficient acceleration process of high energy electrons by coherent whistler mode waves in the Earth's dipole magnetic field, which we have found in our recent test particle simulations. The efficient acceleration process takes place only for weakly relativistic seed electrons of a few hundred keV. Under an assumption that the whistler mode wave packets are excited near the equatorial plane of the inner magnetosphere and propagate away from the equator, the acceleration process becomes irreversible. With a sufficiently long whistler mode wave packet of the order of a few hundred milliseconds, the energetic electrons are accelerated to a relativistic energy range of a few MeV through a single resonant trapping process. We call this particular acceleration process relativistic resonant acceleration (RRA), which can be the mechanism for formation process of relativistic electron flux in the outer radiation belt. A necessary condition for the RRA is a relatively large amplitude of the whistler mode wave in the range of a few hundred pT, which has been confirmed by recent in situ observations of whistler mode chorus emissions by Cluster satellites. Chorus emissions consist of successive generation of rising tones in a frequency range of 0.2 - 0.5 of the local cyclotron frequency, which can make the RRA more effective in the formation process of the relativistic electron flux in the recovery phase of magnetic storms.

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