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| Titel |
Low-frequency fluctuations in the magnetosheath: Double Star TC-1 and Cluster observations |
| VerfasserIn |
J. Du, C. Wang, T. L. Zhang, P. Song, W. Baumjohann |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250024894
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| Zusammenfassung |
| The Double Star TC-1 magnetosheath pass on 26 February 2004 is used to investigate
magnetic field fluctuations. Strong compressional signatures which last for more than an
hour have been found near the magnetopause behind a quasi-perpendicular bow
shock. The combination of TC-1 and Cluster data gave a direct observation that the
interplanetary magnetic field (IMF) cone angle affects the wave characteristics in the
magnetosheath.
Based on the magnetosheath data observed by TC-1 and Cluster in 2004, the magnetic
field fluctuations are statistically investigated in the range of time periods from 4 s to 240 s.
The characteristics of the magnetic field fluctuations are strongly controlled by the angle
between IMF and the normal of the bow shock. Generally speaking, the magnetic field
fluctuations in the quasi-parallel magnetosheath are more intense than those in the
quasi-perpendicular case. With the increase of the local plasma β, both the magnitude and
direction of the magnetic field fluctuate more intensely. There exists an inverse
correlation between the local temperature anisotropy T-¥/T|| and the plasma β. |
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