SM041-0005
Electron Cyclotron Harmonic Waves Observed in Dipolarizing Flux Bundles

Tuesday, 15 December 2020
Poster
Xu Zhang1, Vassilis Angelopoulos2, Anton Artemyev3, Xiaojia Zhang4 and Jiang Liu2, (1)Institute of Geophysics and Planetary Physics Los Angeles, Los Angeles, CA, United States, (2)University of California Los Angeles, Department of Earth, Planetary, and Space Sciences and Institute of Geophysics and Planetary Physics, Los Angeles, CA, United States, (3)University of California Los Angeles, Earth, Planetary, and Space Sciences, Los Angeles, CA, United States, (4)IGPP, UCLA, Los Angeles, CA, United States
Abstract:
Utilizing 10 years of THEMIS satellite observations from 2007 to 2017, we identified all ECH wave events near dipolarization fronts. We report, for the first time, observations of ECH waves at relatively small wave normal angles behind dipolarization fronts. Our statistical results demonstrated that these small wave normal angle ECH waves are frequently observed. These small wave normal angle ECH waves are often observed with cold, dense electrons and located away from the plasma sheet. We then confirmed theoretically that ECH waves with relatively small wave normal angle can be excited by electron beams under plasma sheet conditions.
<< Previous Abstract | Next Abstract >>