| DOI: | 10.1002/grl.50979
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| 论文题名: | Magnetospheric "magic" frequencies as magnetopause surface eigenmodes |
| 作者: | Archer M.O.; Hartinger M.D.; Horbury T.S.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8526
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| EISSN: | 1944-8257
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| 出版年: | 2013
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| 卷: | 40, 期:19 | | 起始页码: | 5003
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| 结束页码: | 5008
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| 语种: | 英语
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| 英文关键词: | magnetopause
; magnetosheath
; magnetosphere
; ULF
; waves
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| Scopus关键词: | Discrete frequencies
; Fundamental frequencies
; Magnetosheaths
; Magnetospheric response
; Simultaneous observation
; Solar wind pressure
; ULF
; Upstream conditions
; Magnetosphere
; Solar wind
; Waves
; Wind effects
; Magnetopause
; eigenvalue
; magnetopause
; magnetosphere
; plasma
; solar wind
; wind forcing
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| 英文摘要: | The persistent so-called "magic" magnetospheric frequencies are thought to be either directly driven by monochromatic solar wind pressure fluctuations or resonantly excited global (cavity/waveguide) or magnetopause surface eigenmodes. We distinguish between these cases by statistically investigating, using simultaneous observations, the magnetospheric response to jets in the subsolar magnetosheath. The broadband jets do not exhibit discrete frequencies but do drive waves at the discrete magic frequencies, with both direct and resonant driving. We show that the expected fundamental frequencies of magnetopause surface eigenmodes have two preferential values over a wide range of upstream conditions, corresponding to fast and slow solar wind, and that their harmonics are in good agreement with the magic frequencies. We also show that the waves are largely inconsistent with global modes outside the plasmasphere. Thus, we conclude that these magic frequencies are most likely due to magnetopause surface eigenmodes. Key Points Broadband magnetosheath jets drive waves at the discrete The fundamental eigenfrequency should be highly correlated with solar wind speed ©2013. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84884969440&doi=10.1002%2fgrl.50979&partnerID=40&md5=fc171200fa846aa38055379c481dce4d
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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/5790
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Space and Atmospheric Physics Group, Blackett Laboratory, Imperial College London, Prince Consort Rd., London SW7 2AZ, United Kingdom
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| Recommended Citation: | |
Archer M.O.,Hartinger M.D.,Horbury T.S.. Magnetospheric "magic" frequencies as magnetopause surface eigenmodes[J]. Geophysical Research Letters,2013-01-01,40(19).
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