Collaborative Research Activities of the Arase and Van Allen Probes
Yoshizumi Miyoshi, Iku Shinohara, Sasha Ukhorskiy, S. G. Claudepierre, Takefumi Mitani, Takeshi Takashima, Tomoaki Hori, O. Santolı́k, Ivana Kolmašová, Shoya Matsuda, Yoshiya Kasahara, M. Teramoto, Yuto Katoh, Mitsuru Hikishima, Hirotsugu Kojima, Satoshi Kurita, Shun Imajo, Nana Higashio, Satoshi Kasahara, Shoichiro Yokota, Kazushi Asamura, Y. Kazama, Shiang‐Yu Wang, Chae‐Woo Jun, Yasumasa Kasaba, Atsushi Kumamoto, Fuminori Tsuchiya, Masafumi Shoji, Satoko Nakamura, M. Kitahara, Ayako Matsuoka, K. Shiokawa, K. Seki, M. Nosé, Kazue Takahashi, Claudia Martinez‐Calderon, G. B. Hospodarsky, C. A. Colpitts, C. A. Kletzing, J. R. Wygant, H. E. Spence, D. N. Baker, G. D. Reeves, J. B. Blake, L. Lanzerotti
Abstract
Abstract This paper presents the highlights of joint observations of the inner magnetosphere by the Arase spacecraft, the Van Allen Probes spacecraft, and ground-based experiments integrated into spacecraft programs. The concurrent operation of the two missions in 2017–2019 facilitated the separation of the spatial and temporal structures of dynamic phenomena occurring in the inner magnetosphere. Because the orbital inclination angle of Arase is larger than that of Van Allen Probes, Arase collected observations at higher $L$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>L</mml:mi> </mml:math> -shells up to $L \sim 10$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>L</mml:mi> <mml:mo>∼</mml:mo> <mml:mn>10</mml:mn> </mml:math> . After March 2017, similar variations in plasma and waves were detected by Van Allen Probes and Arase. We describe plasma wave observations at longitudinally separated locations in space and geomagnetically-conjugate locations in space and on the ground. The results of instrument intercalibrations between the two missions are also presented. Arase continued its normal operation after the scientific operation of Van Allen Probes completed in October 2019. The combined Van Allen Probes (2012-2019) and Arase (2017-present) observations will cover a full solar cycle. This will be the first comprehensive long-term observation of the inner magnetosphere and radiation belts.