Multipoint observations of magnetospheric compression‐related EMIC Pc1 waves by THEMIS and CARISMA
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- M. E. Usanova
- Department of Physics University of Alberta Edmonton, Alberta Canada
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- I. R. Mann
- Department of Physics University of Alberta Edmonton, Alberta Canada
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- I. J. Rae
- Department of Physics University of Alberta Edmonton, Alberta Canada
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- Z. C. Kale
- Department of Physics University of Alberta Edmonton, Alberta Canada
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- V. Angelopoulos
- Department of Earth and Space Sciences University of California Los Angeles USA
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- J. W. Bonnell
- Space Sciences Laboratory University of California Berkeley California USA
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- K.‐H. Glassmeier
- Institut für Geophysik und Extraterrestrische Physik Technische Universität Braunschweig Braunschweig Germany
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- H. U. Auster
- Institut für Geophysik und Extraterrestrische Physik Technische Universität Braunschweig Braunschweig Germany
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- H. J. Singer
- NOAA Space Weather Prediction Center Boulder Colorado USA
書誌事項
- 公開日
- 2008-07-16
- 権利情報
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- http://onlinelibrary.wiley.com/termsAndConditions#vor
- DOI
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- 10.1029/2008gl034458
- 公開者
- American Geophysical Union (AGU)
この論文をさがす
説明
<jats:p>Following a long interval (many days) of sustained very quiet geomagnetic conditions, electromagnetic ion cyclotron (EMIC) wave activity was seen by the CARISMA array (www.carisma.ca) on the ground for several hours simultaneously with enhanced solar wind density and related magnetic compression seen at GOES 12 on 29th June 2007. The THEMIS C, D, and E satellites were outbound in a “string‐of‐pearls” configuration and each observed EMIC waves on L‐shells ranging from 5 to 6.5. THEMIS resolved some of the spatial‐temporal ambiguity and defined the radial extent of EMIC activity to be ∼1.3 Re. The band‐limited EMIC waves were seen slightly further out in radial distance by each subsequent THEMIS satellite, but in each case were bounded at high‐L by a decrease in density as monitored by spacecraft potential. The EMIC wave activity appears to be confined to a region of higher plasma density in the vicinity of the plasmapause, as verified by ground‐based cross‐phase analysis. The structured EMIC waves seen at THEMIS E and on the ground have the same repetition period, in contradiction to expectations from the bouncing wave packet hypothesis. Compression‐related EMIC waves are usually thought to be preferentially confined to higher L's than observed here. Our observations suggest solar wind density enhancements may also play a role in the excitation of radially localised EMIC waves near the plasmapause.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 35 (17), 17-, 2008-07-16
American Geophysical Union (AGU)
