Analysis of EMIC waves in relation to magnetospheric heavy ion density

Hyomin Kim, Virginia Polytechnic Institute and State University, Blacksburg, United States, Eun-Hwa Kim, Princeton University, Princeton Plasma Physics Laboratory, Princeton, NJ, United States, Jay Johnson, Andrews University, Berrien Springs, United States, Dong-Hun Lee, Kyung Hee University, Yongin, Korea, Republic of (South), C. Robert Clauer, National Institute of Aerospace, Hampton, VA, United States, Marc Lessard, University of New Hampshire Main Campus, Durham, NH, United States, Mark J Engebretson, Augsburg University, Physics, Minneapolis, United States and Zhonghua Xu, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
Abstract:
This study presents observations of EMIC wave events and their relation to heavy ion density in the magnetosphere. It is well known that EMIC waves play an important role in particle acceleration and loss via wave-particle interaction. It is critical to know the ion composition in the plasma with which EMIC waves interact in order to understand wave generation and propagation because it controls ion cyclotron resonance frequencies of EMIC waves. The presence of heavy ions (He+ and O+) causes the wave modes to be more complex with two additional resonance (ion-ion hybrid and Buchsbaum resonances) and polarization changes, making it challenging to analyze wave generation and propagation. In this study, we show wave polarization and Poynting flux using data from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) and Van Allen Probes (VAP) satellites and their ground conjunctions and compare them with the heavy ion density estimated by a wave model.
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