| DOI: | 10.1002/2014GL060524
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| 论文题名: | Heating of ionospheric ion beams in inverted-V structures |
| 作者: | Cui Y.B.; Fu S.Y.; Parks G.K.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10620
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| EISSN: | 1944-10351
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| 出版年: | 2014
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| 卷: | 41, 期:11 | | 起始页码: | 3752
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| 结束页码: | 3758
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| 语种: | 英语
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| 英文关键词: | acceleration
; inverted-V structure
; ion beams
; magnetosphere-ionosphere coupling
; particle heating
; U-shaped potential structure
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| Scopus关键词: | Acceleration
; Ion beams
; Ionosphere
; Magnetic fields
; Ambient density
; Energy fluxes
; Magnetosphere-ionosphere coupling
; Plasma sheet boundary layer
; Potential difference
; Potential drop
; Potential structure
; Streaming velocity
; Ions
; boundary layer
; energy flux
; ion exchange
; ionosphere
; latitude
; magnetic field
|
| 英文摘要: | Beams of H+, He+, and O+ ions have been observed when the four Cluster satellites crossed the high-latitude plasma sheet boundary layer at ∼4 RE. These beams appear as inverted-V structures in the energy flux time spectrograms. The pitch angles of the beams range from ∼0 to 30° indicating the ions are streaming along the magnetic field out of the ionosphere. The streaming velocity is a few tens of km/s to several hundred km/s, consistent with the beams having gone through a potential drop of several tens of eV to a few keV. These beams are intense with beam to ambient density ratios, δnb/nT, as large as ∼0.3. The beams are hotter than the ionospheric ion thermal energy, indicating the ions have been heated while accelerated along the magnetic field. We present first results that show the ions tend to be hotter at the peak (several hundred eV) than at the start of the inverted-V structures (a few tens of eV). These results interpreted in terms of a U-shaped potential structure indicate the hottest ions come from the central region where the potential difference is maximum. © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902030859&doi=10.1002%2f2014GL060524&partnerID=40&md5=1afcf0ecf92ed7fc4e26569228498aec
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/7884
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| Appears in Collections: | 气候减缓与适应
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作者单位: | School of Earth and Space Sciences, Peking University, Beijing, China
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| Recommended Citation: | |
Cui Y.B.,Fu S.Y.,Parks G.K.. Heating of ionospheric ion beams in inverted-V structures[J]. Geophysical Research Letters,2014-01-01,41(11).
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