Collaborative Research Activities of the Arase and Van Allen Probes

Y. Miyoshi, I. Shinohara, S. Ukhorskiy, S. G. Claudepierre, T. Mitani, T. Takashima, T. Hori, O. Santolik, I. Kolmasova, S. Matsuda, Y. Kasahara, M. Teramoto, Y. Katoh, M. Hikishima, H. Kojima, S. Kurita, S. Imajo, N. Higashio, S. Kasahara, S. YokotaK. Asamura, Y. Kazama, S. Y. Wang, C. W. Jun, Y. Kasaba, A. Kumamoto, F. Tsuchiya, M. Shoji, S. Nakamura, M. Kitahara, A. Matsuoka, K. Shiokawa, K. Seki, M. Nosé, K. Takahashi, C. Martinez-Calderon, G. Hospodarsky, C. Colpitts, Craig Kletzing, J. Wygant, H. Spence, D. N. Baker, G. D. Reeves, J. B. Blake, L. Lanzerotti

Research output: Contribution to journalReview articlepeer-review

11 Scopus citations


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-shells up to L∼ 10. 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.

Original languageEnglish (US)
Article number38
JournalSpace Science Reviews
Issue number5
StatePublished - Aug 2022

Bibliographical note

Funding Information:
This work was supported by JSPS KAKENHI (15H05747, 15H05815, 16H06286, 20H01959), JSPS-CAS bilateral project (JPJSBP120192504, JSPS-19-05), GACR grant 20-09671S, and by MSMT grant LTAUSA17070. Work at The Aerospace Corporation was supported by RBSP-ECT funding provided by JHU/APL Contract 967399 under NASA’s Prime Contract NAS501072. The research at the University of Iowa was supported by JHU/APL through contract No. 921647 under NASA’s prime contract No. NAS5-01072. The work at NJIT was supported by JHU/APL Subcontract 937836 to the New Jersey Institute of Technology under NASA Prime Contract NAS5-01072. Work at the University of Minnesota supported by RBSP-EFW funding provided by JHU/APL contract 922613, under NASA’s prime contract NAS5-01072, and by NASA grant 80NSSC19K0842.

Funding Information:
We thank all project members of the Van Allen Probes and Arase teams. Science data of the ERG (Arase) satellite were obtained from the ERG Science Center operated by ISAS/JAXA and ISEE/Nagoya University ( , Miyoshi et al. 2018b). Science data from the Van Allen Probes EMFISIS instrument rom supporting the conclusions of the paper were obtained from the University of Iowa (

Publisher Copyright:
© 2022, The Author(s).


  • Arase
  • Inner magnetosphere
  • Radiation belts
  • Van Allen Probes


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