| DOI: | 10.1002/2014GL061677
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| 论文题名: | Steady-state field-aligned currents at Mercury |
| 作者: | Anderson B.J.; Johnson C.L.; Korth H.; Slavin J.A.; Winslow R.M.; Phillips R.J.; McNutt R.L.; Jr.; Solomon S.C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9614
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| EISSN: | 1944-9345
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| 出版年: | 2014
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| 卷: | 41, 期:21 | | 起始页码: | 7444
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| 结束页码: | 7452
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| 语种: | 英语
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| 英文关键词: | Birkeland currents
; conductivity
; Mercury
; MESSENGER
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| Scopus关键词: | Conductive materials
; Earth (planet)
; Electric conductivity
; Electric potential
; Mercury (metal)
; Electrical conductance
; Field aligned currents
; Field observations
; Magnetic reconnections
; MESSENGER
; MESSENGER spacecraft
; Northern Hemispheres
; Orders of magnitude
; Orbits
; electrical conductivity
; magnetic field
; magnetopause
; Mercury (planet)
; Northern Hemisphere
; steady-state equilibrium
|
| 英文摘要: | Magnetic field observations acquired in orbit about Mercury by the MESSENGER spacecraft demonstrate the presence in the planet's northern hemisphere of Birkeland currents that flow to low altitudes. Currents of density 10-30 nA/m2 flow downward at dawn and upward at dusk. Total currents are typically 20-40 kA and exceed 200 kA during disturbed conditions. The current density and total current are two orders of magnitude lower than at Earth. An electric potential of ~30 kV from dayside magnetopause magnetic reconnection implies a net electrical conductance of ~1 S. A spherical-shell conductance model indicates closure of current radially through the low-conductivity layers near the surface and by lateral flow from dawn to dusk through more conductive material at depth. Key Points Steady-state Birkeland currents are present at MercuryThe currents are 100 times weaker than at Earth and of only Region 1 polarityThe currents close through the interior of the planet ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84912059098&doi=10.1002%2f2014GL061677&partnerID=40&md5=b74a1e3a32683973a25b1daaf47dd504
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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/6878
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Johns Hopkins University, Applied Physics Laboratory, Laurel, MD, United States
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| Recommended Citation: | |
Anderson B.J.,Johnson C.L.,Korth H.,et al. Steady-state field-aligned currents at Mercury[J]. Geophysical Research Letters,2014-01-01,41(21).
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