Journal article
Relative Contribution of ULF Waves and Whistler‐Mode Chorus to the Radiation Belt Variation During the May 2017 Storm
Journal of geophysical research. Space physics, Vol.126(11), p.n/a
11/2021
DOI: 10.1029/2020JA028972
Abstract
Abstract We investigate the time and location where ULF waves and whistler‐mode chorus contributed to the net flux enhancement of relativistic electrons during the magnetic storm of May 2017. During the early recovery phase, both ULF and chorus waves contribute to the enhancement of relativistic electron fluxes, but ULF waves play roles of the inward diffusion. During the late recovery phase, both Van Allen Probe‐B and Arase show that whistler‐mode chorus contributes to the flux enhancement confined in the L‐value. The CRCM coupled with BATS‐R‐US simulation qualitatively reproduces the global evolution of ULF waves. Although the electron flux is underestimated by the simulation, this study reveals a large anisotropy of hot electrons in the region where whistler‐mode chorus waves were actually observed by satellites. In addition, the estimated magnetic field curvature on the dayside is small during the recovery phase. Furthermore, we investigate the control of wave evolution. Both observations and the simulation suggest that the observed ULF waves in the frequency range of ∼2–5 mHz are excited by the enhancement of the solar wind dynamic pressure. Observations also indicate that whistler‐mode chorus on the nightside is predominantly excited by hot electrons with temperature anisotropy, whereas the dayside chorus is enhanced by the change of the magnetic field line configuration. The estimated spatial distributions of electron anisotropy and magnetic field curvature provide an explanation for the presence of enhanced whistler‐mode chorus in the dusk sector, which is far from the usual location of wave generation.
Key Points ULF waves play roles of radially inward diffusion during the early recovery phase The whistler‐mode chorus during the late recovery phase contributes to the flux enhancement confined in the L‐value On the dayside, the magnetic field curvature controls the occurrence of whistler‐mode chorus
Details
- Title: Subtitle
- Relative Contribution of ULF Waves and Whistler‐Mode Chorus to the Radiation Belt Variation During the May 2017 Storm
- Creators
- Naoko Takahashi - The University of TokyoKanako Seki - The University of TokyoMei‐Ching Fok - Goddard Space Flight CenterYihua Zheng - Goddard Space Flight CenterYoshizumi Miyoshi - Nagoya UniversitySatoshi Kasahara - The University of TokyoKunihiro Keika - The University of TokyoDavid Hartley - University of IowaYoshiya Kasahara - Kanazawa UniversityYasumasa Kasaba - Tohoku UniversityNana Higashio - The University of TokyoAyako Matsuoka - Kyoto UniversityShoichiro Yokota - Osaka UniversityTomoaki Hori - Nagoya UniversityMasafumi Shoji - Nagoya UniversitySatoko Nakamura - Nagoya UniversityShun Imajo - Kyoto UniversityIku Shinohara - Japan Aerospace Exploration Agency
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.126(11), p.n/a
- DOI
- 10.1029/2020JA028972
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Grant note
- DOI: 10.13039/501100001700, name: Ministry of Education, Culture, Sports, Science and Technology, award: 16H06286, 18KK0099, 15H05815, 20H01957, 20H0195
- Language
- English
- Date published
- 11/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984548669102771
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