Physics – Plasma Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709101u&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 9, CiteID L09101
Physics
Plasma Physics
12
Magnetospheric Physics: Energetic Particles: Trapped, Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Space Plasma Physics: Wave/Particle Interactions (2483, 6984), Space Plasma Physics: Plasma Energization
Scientific paper
A storm main phase can produce a rapid depletion of electron fluxes in the Earth's outer radiation belt and the pitch-angle scattering by the electromagnetic ion cyclotron (EMIC) waves is one mechanism that might account for the electron losses. To efficiently scatter the bulk of the electron population, below 1-2 MeV, the EMIC waves would need to have significant power very near a heavy ion gyrofrequency. We present a wave event at the storm main phase and carefully examine the wave spectrum to identify the energy range of electrons scattered by the waves. The EMIC waves exhibit power right below the He+ gyrofrequency and we estimate that they can interact with electrons having energies as low as 400 keV producing rapid scattering at almost all pitch-angle values on the time scales of seconds. Our statistical analysis suggests that this event is not an exception; the majority of EMIC waves can scatter electrons with energies under 2 MeV. Our results show that EMIC waves can be one of the dominant radiation belt loss mechanisms during the storm main phase.
Anderson Benjamin J.
Mansergh Thorne Richard
Shprits Yuri Y.
Takahashi Keitaro
Ukhorskiy Aleksandr Y.
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