Observations of relativistic electron precipitation from the radiation belts driven by EMIC waves
Article first published online: 22 AUG 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 16, August 2008
How to Cite
2008), Observations of relativistic electron precipitation from the radiation belts driven by EMIC waves, Geophys. Res. Lett., 35, L16106, doi:10.1029/2008GL034804., , , , , , and (
- Issue published online: 22 AUG 2008
- Article first published online: 22 AUG 2008
- Manuscript Accepted: 21 JUL 2008
- Manuscript Revised: 16 JUL 2008
- Manuscript Received: 27 MAY 2008
- EMIC waves;
- subionospheric propagation
 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.