Variation of Molecular Ions in the Inner Magnetosphere Observed by the Arase Satellite
Abstract We analyzed time‐of‐flight (TOF) data from the Arase satellite to investigate temporal variations of the molecular ion group (O 2 + , NO + , and N 2 + ) at 19.2 keV/q in the inner magnetosphere for 6 years from the solar declining to rising phase. The molecular ions counts were estimated by subtracting the background contamination of oxygen counts. While the number of clear molecular ion events was small, the estimated counts exhibited good correlation with the solar wind dynamic pressure and SYM‐H index. Long‐term variations of the molecular ions differed from those of counts of the O + and N + group. Additionally, we discuss the importance of the solar wind dynamic pressure in causing variations of molecular ions in the inner magnetosphere.
Authors
- Iku Shinohara (ORCID: https://orcid.org/0000-0003-2700-0353)
- K. Seki (ORCID: https://orcid.org/0000-0001-5557-9062)
- Yasunobu Ogawa (ORCID: https://orcid.org/0000-0002-8118-4475)
- L. M. Kistler (ORCID: https://orcid.org/0000-0002-8240-5559)
- Kazushi Asamura (ORCID: https://orcid.org/0000-0002-6076-3814)
- Satoko Nakamura (ORCID: https://orcid.org/0000-0003-4367-696X)
- Yoshizumi Miyoshi (ORCID: https://orcid.org/0000-0001-7998-1240)
- Akari Nagatani (ORCID: https://orcid.org/0009-0002-5067-142X)
Institutions
- University of New Hampshire (US)
- National Institute of Polar Research (JP)
- National Sagamihara Hospital (JP)
- Nagoya University (JP)
Publication Details
- Journal
- Geophysical Research Letters
- Published
- 2024-09-16
- DOI
- https://doi.org/10.1029/2024gl108340
- Citations
- 2
- Primary Topic
- Ionosphere and magnetosphere dynamics
- Type
- article
- Field-Weighted Citation Impact
- 0.66
Funders
- Japan Society for the Promotion of Science