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| Titel |
Dayside magnetopause transients correlated with changes of the magnetosheath magnetic field orientation |
| VerfasserIn |
O. Tkachenko, J. Safrankova, Z. Nemecek, D. G. Sibeck |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 4 ; Nr. 29, no. 4 (2011-04-19), S.687-699 |
| Datensatznummer |
250017005
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| Publikation (Nr.) |
 copernicus.org/angeo-29-687-2011.pdf |
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| Zusammenfassung |
| The paper analyses one long-term pass (26 August 2007) of the THEMIS
spacecraft across the dayside low-latitude magnetopause. THEMIS B, serving
partly as a magnetosheath monitor, observed several changes of the magnetic
field that were accompanied by dynamic changes of the magnetopause location
and/or the structure of magnetopause layers observed by THEMIS C, D, and E,
whereas THEMIS A scanned the inner magnetosphere. We discuss the plasma and
the magnetic field data with motivation to identify sources of observed
quasiperiodic plasma transients. Such events at the magnetopause are usually
attributed to pressure pulses coming from the solar wind, foreshock
fluctuations, flux transfer events or surface waves. The presented transient
events differ in nature (the magnetopause surface deformation, the low-latitude
boundary layer thickening, the crossing of the reconnection site), but we found
that all of them are associated with changes of the magnetosheath magnetic
field orientation and with enhancements or depressions of the plasma density.
Since these features are not observed in the data of upstream monitors, the
study emphasizes the role of magnetosheath fluctuations in the solar
wind-magnetosphere coupling. |
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