Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3516106r&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 16, CiteID L16106
Physics
9
Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Energetic Particles: Precipitating, Magnetospheric Physics: Ring Current, Ionosphere: Particle Precipitation, Atmospheric Processes: Remote Sensing
Scientific paper
For some time theoretical modeling has shown that electromagnetic ion cyclotron (EMIC) waves should play an important role in the loss of relativistic electrons from the radiation belts, through precipitation into the atmosphere. Up to now there has been limited experimental evidence for relativistic electron precipitation driven by EMIC waves. In this paper we present case studies of events showing EMIC waves, observed by ground-based pulsation magnetometers, which are linked to strong responses in a subionospheric precipitation monitor. This response is consistent with precipitation occurring near the plasmapause, where EMIC waves may resonate with relativistic electrons. At the same time there is only a weak response in a co-located riometer chain, as expected for relativistic electron precipitation that penetrates deeply into the atmosphere.
Clilverd Mark A.
Dietrich Sarah
Raita Tero
Rodger Craig J.
Seppälä Annika
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