JpGU-AGU Joint Meeting 2017

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[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM16] [EE] Physics of Inner Magnetosphere Coupling

Tue. May 23, 2017 3:30 PM - 5:00 PM A02 (Tokyo Bay Makuhari Hall)

convener:Danny Summers(Memorial University of Newfoundland), Jichun Zhang(University of New Hampshire Main Campus), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Kunihiro Keika(Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo ), Aleksandr Y Ukhorskiy(Johns Hopkins University Applied Physics Laboratory), Dae-Young Lee(Chungbuk Natl Univ), Yiqun Yu(Beihang University), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Chairperson:Aleksandr Ukhorskiy(Johns Hopkins University Applied Physics Laboratory)

4:30 PM - 4:45 PM

[PEM16-17] Van Allen Probes observation of plasmaspheric electron acceleration by ULF waves at the plasmaspheric boundary layer

*Jie Ren1,2, Qiugang Zong1, Yoshizumi Miyoshi2, Xuzhi Zhou1, Yongfu Wang1, Robert Rankin3 (1.Institute of Space Physics and Applied Technologies, Peking University, 2.Institute for Space-Earth Environmental Research, Nagoya University, 3.Department of Physics University of Alberta Edmonton, AB, Canada )

Keywords:Plasmaspheric electron acceleration, ULF waves, Drift-bounce resonance, Wave exciting mechanism, Multi-spacecraft observation

In this study, we report the plamsmaspheric electron acceleration caused by drift-bounce resonance with ULF waves at the plasmaspheric boundary layer. Long-lasting ULF waves in the period of about 1 min, identified as second harmonic mode, were observed by Van Allen Probe B during two successive orbits. During ULF wave appearance, both plasmaspheric electrons (<200 eV) and energetic protons (10-20 keV) showed bi-directional pitch angle signature, which is caused by drift-bounce resonance with N=1. And the averaged plasmaspheric electron flux enhanced up to 5 times of that when there were no ULF wves. Based on multi-spacecraft observation using two Van Allen Probes, two GOES satellites (GOES 13 and GOES15) and MMS 1, these ULF waves mainly distributed in the duskside, and MMS 1 observed no external sources when travelling inbound and outbound in the magnetosphere, which suggests that these ULF waves were excited through drift-bounce resonant instability caused by substorm-injected energetic protons.