Modulation of electron pitch angle distributions observed by MEP-e onboard the Arase satellite

Tuesday, 6 March 2018: 14:05
Longshot and Bogey (Hotel Quinta da Marinha)
Satoshi Kurita1, Yoshizumi Miyoshi1, Satoshi Kasahara2, Shoichiro Yokota3, Yoshiya Kasahara4, Shoya Matsuda1, Atsushi Kumamoto5,6, Fuminori Tsuchiya6, Ayako Matsuoka7 and Iku Shinohara7, (1)Nagoya University, Nagoya, Japan, (2)ISAS Institute of Space and Astronautical Science, Kanagawa, Japan, (3)ISAS Institute of Space and Astronautical Science, Sagamihara, Japan, (4)Kanazawa University, Kanazawa, Japan, (5)Tohoku Univ, Sendai, Japan, (6)Tohoku University, Sendai, Japan, (7)ISAS/JAXA, Sagamihara, Japan
Abstract:
We report on the modulation of electron pitch angle distributions observed by Medium Energy Particle experiment-electron analyzer (MEP-e) onboard the Arase satellite. MEP-e has a capability to measure three dimensional distribution functions of electrons in the energy range from 7 keV to 80 keV. The pitch angle distributions are characterized by flux enhancement of 10-30 keV electrons in a narrow and oblique pitch angle range. The observed pitch angle distributions are similar to quasi-periodic bursts of energetic electrons in conjunction with upper-band chorus reported by Fennell et al. [2014] based on the Van Allen Probes measurement. The MEP-e measurement newly found that decrease in electron flux below 10 keV at low pitch angles is also accompanied with the flux enhancement. We found several events showing quasi-periodic bursts of energetic electrons in the MEP-e dataset, and plasma wave measurements by Plasma Wave Experiment (PWE) revealed that upper-band chorus is not necessarily observed in conjunction with the flux enhancement. We will show characteristics of the flux enhancement observed by MEP-e and discuss on the generation mechanism of the flux variation based on simultaneous electron and plasma wave measurement by the Arase satellite.
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