Giant Undulations Driven by Pitch‐Angle Scattering of Time Domain Structures Modulated by Plasmapause Surface Wave
Abstract Plasmapause surface waves (PSWs) near the plasmapause boundary are regarded to be the magnetospheric source of ionospheric auroral giant undulations (GUs) located at the equatorward boundary of diffuse aurora. However, the observational evidence of wave‐particle interaction connecting PSWs and GUs is absent. In this letter, we demonstrate GUs are driven by pitch‐angle scattering of time domain structures modulated by the PSWs, based on the conjugated ionospheric and magnetospheric observations. Specifically, ionospheric GUs are lighted by the pitch‐angle scattering of <1 keV thermal electron and ions and energetic ions with energy up to dozens of keV near the plasmapause. Further, the total fluxes during one PSW period and energy of scattered electron and ions determine the size and luminosity of GUs. Our research provides observational evidence that PSWs cause periodic electron precipitation via modulating the time domain structures rather than the previously predicted chorus or electron cyclotron harmonic waves.
Authors
- Yongliang Zhang (ORCID: https://orcid.org/0000-0003-4851-1662)
- Yi‐Jia Zhou (ORCID: https://orcid.org/0000-0003-3982-4093)
- Quanqi Shi (ORCID: https://orcid.org/0000-0001-6835-4751)
- Yong Wei (ORCID: https://orcid.org/0000-0001-7183-0229)
- Zhonghua Yao (ORCID: https://orcid.org/0000-0001-6826-2486)
- Xiaoxin Zhang (ORCID: https://orcid.org/0000-0002-7759-7402)
- Jun Zhong (ORCID: https://orcid.org/0000-0003-4187-3361)
- Zhaojin Rong (ORCID: https://orcid.org/0000-0003-4609-4519)
- Jian Liu (ORCID: https://orcid.org/0000-0001-7484-401X)
- Fei He (ORCID: https://orcid.org/0000-0003-0542-2686)
- Peng Du (ORCID: https://orcid.org/0000-0003-0482-4480)
- Ming Guo
Institutions
- Civil Aviation Administration of China (CN)
- Planetary Science Institute (US)
- China Meteorological Administration (CN)
- Shandong University (CN)
- Chinese Academy of Sciences (CN)
- Johns Hopkins University Applied Physics Laboratory (US)
- National Space Science Center (CN)
- Institute of Geology and Geophysics (CN)
- Space Engineering University (CN)
- University of Chinese Academy of Sciences (CN)
- University of Hong Kong (HK)
Publication Details
- Journal
- Geophysical Research Letters
- Published
- 2025-02-07
- DOI
- https://doi.org/10.1029/2024gl111782
- Citations
- 2
- Primary Topic
- Ionosphere and magnetosphere dynamics
- Type
- article
- Field-Weighted Citation Impact
- 2.31
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Office of Public Affairs
- National Key Research and Development Program of China
- Youth Innovation Promotion Association