The Global Distribution of EMIC Waves Derived from THEMIS Observations

Details The Global Distribution of EMIC Waves Derived from THEMIS Observations The Global Distribution of EMIC Waves Derived from THEMIS Observations

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13b2066m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13B-2066

Physics

[2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

We have investigated the global distribution of electromagnetic ion cyclotron (EMIC) wave occurrence and the wave properties using the Time History of Events and Macroscale Interactions during Substorms (THEMIS) observations from 2007 to 2010. The wave properties include wave power, polarization, and normal angle measured in the range of 4 RE to 14 RE at all magnetic local times. Our results partly agree to the previous ones obtained within 9.25 RE by Andersion et al. [JGR, 1992] using Active Magnetospheric Particle Tracer Explorer/Charge Composition Explorer (AMPTE/CCE) observations in that dawn events are mostly of the linearly polarized waves emitted in the hydrogen band whereas dusk events are of the left-hand polarized waves emitted in the helium band. As found earlier, the occurrence rate generally increases with the radial distance. New findings in this study are: (1) the occurrence rate keeps increasing beyond 9 RE up to 14 RE and, as a result, EMIC wave occurrence rate at dawn is as high as that at dusk. (2) The EMIC waves at dawn are more obliquely propagating than those at dusk. (3) The EMIC waves at dawn are weakly polarized at left-hand sense around the equator, become linearly polarized with increasing latitude and eventually change to a weak right-hand polarization at high latitudes. The EMIC waves at dusk, on the other hand, strongly left-hand polarized in a wide range of latitude. We discuss the latitude dependence of wave polarization at dawn in favor of the wave mode conversion process.

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