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| Titel |
Super fast plasma streams as drivers of transient and anomalous magnetospheric dynamics |
| VerfasserIn |
S. Savin, E. Amata, L. Zelenyi, V. Lutsenko, J. Safrankova, Z. Nemecek, N. Borodkova, J. Buechner, P. W. Daly, E. A. Kronberg, J. Blecki, V. Budaev, L. Kozak, A. Skalsky, L. Lezhen |
| 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 ; 30, no. 1 ; Nr. 30, no. 1 (2012-01-03), S.1-7 |
| Datensatznummer |
250017157
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| Publikation (Nr.) |
 copernicus.org/angeo-30-1-2012.pdf |
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| Zusammenfassung |
We present multi spacecraft measurements in the magnetosheath (MSH)
and in the solar wind (SW) by Interball, Cluster and Polar, demonstrating
that coherent structures with magnetosonic Mach number up to 3 –
Supermagnetosonic Plasma Streams (SPS) – generate
transient and anomalous boundary dynamics, which may cause
substantial displacements of the magnetospheric boundaries and the
riddling of peripheral boundary layers.
In this regard, for the first time, we describe a direct
plasma penetration into the flank boundary layers, which is a candidate for
being the dominant transport mechanism for disturbed MSH periods.
Typically SPS's have a ram pressure exceeding by several times that
of the SW and lead to long-range correlations between processes at the bow
shock (BS) and at the magnetopause (MP) on one side and between MSH and
MP boundary layers on the other side. We demonstrate that
SPS's can be observed both near the BS and near the MP and argue that they
are often triggered by hot flow anomalies (HFA), which
represent local obstacles to the SW flow and can induce the SPS generation
as a means for achieving a local flow balance. Finally, we also discuss
other causes of SPS's, both SW-induced and intrinsic to the MSH.
SPS's appear to be universal means for establishing a new
equilibrium between flowing plasmas and may also prove to be important for
astrophysical and fusion applications. |
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