Relativistic electron acceleration and precipitation during resonant interactions with whistler-mode chorus

Details Relativistic electron acceleration and precipitation during resonant interactions with whistler-mode chorus Relativistic electron acceleration and precipitation during resonant interactions with whistler-mode chorus

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30j..34h&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 10, pp. 34-1, CiteID 1527, DOI 10.1029/2003GL016973

Physics

Plasma Physics

56

Space Plasma Physics: Wave/Particle Interactions, Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Charged Particle Motion And Acceleration

Scientific paper

Resonant interactions with whistler-mode chorus waves provide an important process for electron loss and acceleration during storm times. We demonstrate that wave propagation significantly affects the electron scattering rates. We show that stormtime chorus waves outside the plasmapause can scatter equatorial electrons <=60 keV into the loss cone and accelerate trapped electrons up to ~ MeV energies at large pitch-angles. Using ray tracing to map the waves to higher latitudes, we show that the decrease in the ratio between the electron plasma and gyro frequencies, along with the normalized chorus frequency bandwidth, enable much higher energy electrons ~1 MeV to be scattered into the loss cone. We suggest that off equatorial pitch-angle scattering by chorus waves is responsible for relativistic micro-burst precipitation seen on SAMPEX. Off-equatorial scattering at pitch-angles well away from the loss cone also contributes to the acceleration of higher energy >=3 MeV electrons.

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