| DOI: | 10.1002/2014GL059582
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| 论文题名: | M-I coupling scales and energy dumping |
| 作者: | Haerendel G.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-10239
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| EISSN: | 1944-9970
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| 出版年: | 2014
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| 卷: | 41, 期:6 | | 起始页码: | 1846
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| 结束页码: | 1853
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| 语种: | 英语
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| 英文关键词: | M-I coupling
; scale breaking
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| Scopus关键词: | Energy conversion
; Ionosphere
; Magnetosphere
; Effective resistances
; Magnetosphere-ionosphere coupling
; Perfect matchings
; Quasi-stationary
; scale breaking
; Top-side ionosphere
; Wave impedances
; Wave reflections
; Hard facing
; atmospheric electricity
; aurora
; electron
; ionosphere
; magnetosphere
; plasma
; wave field
; wave reflection
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| 英文摘要: | The paper reviews three magnetosphere-ionosphere coupling scales characterizing (1) inverted-V auroral arcs, (2) so-called Alfvénic arcs, and (3) dense plasma clouds artificially injected into the magnetosphere. The three scale-breaking processes are different but follow all from the principle of perfect matching of the wave impedance of the energy and momentum carrier with the effective resistance of the energy dump. As a consequence, wave reflections from the ionosphere are absent or present only in a short initial phase and lead to quasi-stationary wave fields. In inverted-V auroral arcs the energy conversion occurs in the low magnetosphere by postacceleration of the current-carrying hot electrons. For the Alfvénic arc the energy is transferred first to dispersive Alfvén waves which are then damped in the topside ionosphere by accelerating electrons along B and ions transversely to B. Barium plasma clouds break into narrow striations mapping to ionospheric scales that experience a strongly reduced Pedersen conductivity and thus achieve the perfect matching. It is also argued that the scale ΣP/K, derived from electrostatic mapping, is not suited to describe M-I coupling. © 2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84896551998&doi=10.1002%2f2014GL059582&partnerID=40&md5=d6d710ed8170284bc1b51cf7747d1492
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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/7503
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Max Planck Institute for Extraterrestrial Physics, Garching, Germany
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| Recommended Citation: | |
Haerendel G.. M-I coupling scales and energy dumping[J]. Geophysical Research Letters,2014-01-01,41(6).
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