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Off-Equatorial Mini...
Off-Equatorial Minima Effects on ULF Wave-Ion Interaction in the Dayside Outer Magnetosphere
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- Li, Xing-Yu (författare)
- Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China.
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- Liu, Zhi-Yang (författare)
- Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China.
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- Zong, Qiu-Gang (författare)
- Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China.
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- Zhou, Xu-Zhi (författare)
- Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China.
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- Hao, Yi-Xin (författare)
- Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China.
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- Pollock, Craig J. (författare)
- Denali Sci, Fairbanks, AK USA.
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- Russell, Christopher T. (författare)
- Univ Calif Los Angeles, Dept Earth & Space Sci, Los Angeles, CA 90024 USA.
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- Lindqvist, Per-Arne (författare)
- KTH,Rymd- och plasmafysik
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Peking Univ, Inst Space Phys & Appl Technol, Beijing, Peoples R China Denali Sci, Fairbanks, AK USA. (creator_code:org_t)
- American Geophysical Union (AGU), 2021
- 2021
- Engelska.
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Ingår i: Geophysical Research Letters. - : American Geophysical Union (AGU). - 0094-8276 .- 1944-8007. ; 48:18
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The ultra-low frequency wave-particle drift-bounce resonance in the inner magnetosphere has been studied in detail, due to its important role in particle energization. However, it remains an open question how drift-bounce resonance manifests in the dayside outer magnetosphere, where particles' orbits show bifurcations because of off-equatorial magnetic field minima. In this study, we investigate this question, by analyzing Magnetospheric Multiscale observations of the January 20, 2017 event. A test-particle simulation is conducted to help us understand the observations. The observed pitch angle-time spectrograms show "pawtrack-like" structures. We find there are more than two resonant pitch angles at fixed energy, since off-equatorial minima change the relationship between the bounce (drift) frequency and pitch angle from unimodal function to trimodal function. These results reveal a new drift-bounce acceleration mechanism in the dayside outer magnetosphere, which potentially affects the efficiency of particle energization during geomagnetic activities like geomagnetic storms.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- ultra-low frequency wave
- wave-particle interaction
- outer magnetosphere
- particle acceleration
- drift-bounce resonance
- dayside magnetosphere
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