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  Modulation of Whistler Mode Waves by Ultra‐Low Frequency Wave in a Macroscale Magnetic Hole: MMS Observations

Zhang, H., Zhong, Z., Tang, R., Deng, X., Li, H., Wang, D. (2021): Modulation of Whistler Mode Waves by Ultra‐Low Frequency Wave in a Macroscale Magnetic Hole: MMS Observations. - Geophysical Research Letters, 48, 22, e2021GL096056.
https://doi.org/10.1029/2021GL096056

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008817 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008817_1
Genre: Journal Article

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 Creators:
Zhang, He1, Author
Zhong, Zhihong1, Author
Tang, Rongxin1, Author
Deng, Xiaohua1, Author
Li, Haimeng1, Author
Wang, D.2, Author              
Affiliations:
1External Organizations, ou_persistent22              
22.7 Space Physics and Space Weather, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_2239888              

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 Abstract: We report the quasi-periodic whistler-mode waves corresponding to electron temperature anisotropy T⊥/T// < 1 at the center of a macroscale magnetic hole (MH) near the Earth's magnetopause observed by the Magnetospheric Multiscale mission. A significant ultra-low frequency (ULF) wave of background magnetic field was observed in this MH. The ULF wave dramatically exacerbates the evolution of MH and the formation of the donut-shaped electron pitch angle distribution (PAD) in the macroscale MH. When the whistler-mode waves were generated, they are consistent with troughs of the ULF wave and density increases, which is also related to the butterfly type PAD at those moments. The analysis of dispersion relation and cyclotron resonance condition indicate that whistler-mode waves were mainly generated by the butterfly type PAD of electrons. Our results provides new insights into one possible excitation mechanism of whistler-mode wave.

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 Dates: 2021-11-162021
 Publication Status: Finally published
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 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2021GL096056
GFZPOF: p4 T1 Atmosphere
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Title: Geophysical Research Letters
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 48 (22) Sequence Number: e2021GL096056 Start / End Page: - Identifier: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)