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Annales Geophysicae An open-access journal of the European Geosciences Union
Ann. Geophys., 33, 1173-1181, 2015
https://doi.org/10.5194/angeo-33-1173-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Regular paper
25 Sep 2015
Combined effects of concurrent Pc5 and chorus waves on relativistic electron dynamics
C. Katsavrias1,2, I. A. Daglis1, W. Li3, S. Dimitrakoudis4, M. Georgiou1, D. L. Turner5, and C. Papadimitriou1 1Department of Physics, National and Kapodistrian University of Athens, Athens, Greece
2Department of Physics, Aristotle University of Thessaloniki, Thessaloniki, Greece
3Department of Atmospheric and Oceanic Sciences, UCLA, California, USA
4Institute for Astronomy, Astrophysics, Space Applications & Remote Sensing, National Observatory of Athens, Penteli, Greece
5The Aerospace Corporation, El Segundo, California, USA
Abstract. We present electron phase space density (PSD) calculations as well as concurrent Pc5 and chorus wave activity observations during two intense geomagnetic storms caused by interplanetary coronal mass ejections (ICMEs) resulting in contradicting net effect. We show that, during the 17 March 2013 storm, the coincident observation of chorus and relativistic electron enhancements suggests that the prolonged chorus wave activity seems to be responsible for the enhancement of the electron population in the outer radiation belt even in the presence of pronounced outward diffusion. On the other hand, the significant depletion of electrons, during the 12 September 2014 storm, coincides with long-lasting outward diffusion driven by the continuous enhanced Pc5 activity since chorus wave activity was limited both in space and time.

Citation: Katsavrias, C., Daglis, I. A., Li, W., Dimitrakoudis, S., Georgiou, M., Turner, D. L., and Papadimitriou, C.: Combined effects of concurrent Pc5 and chorus waves on relativistic electron dynamics, Ann. Geophys., 33, 1173-1181, https://doi.org/10.5194/angeo-33-1173-2015, 2015.
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