 |
| Titel |
Multi-scale analysis of reconnection and current disruption associated fluctuations during magnetospheric substorms |
| VerfasserIn |
Z. Vörös, A. Runov, V. Angelopoulos, M. P. Leubner, W. Baumjohann |
| Konferenz |
EGU General Assembly 2009
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250021815
|
|
|
|
|
|
| Zusammenfassung |
| Energy accumulation processes associated with subsequent explosive energy
release phenomena are commonly observed in space and astrophysical plasmas. The
most accessible space system in which explosive energy accumulation-release
processes occur is represented by the Earth's magnetosphere during
magnetospheric substorms. Since the explosive onset of substorms is
localized in space and the subsequent energy redistribution affects large
portions of the magnetosphere after the onset within 1-3 minutes, the
identification of a triggering mechanism and its location is difficult. The time
history of substorm signatures observed in-situ by the THEMIS satellites at
multiple locations and available from ground-based measurements indicates that
the source of the first substorm activation is magnetic reconnection in the
mid-tail followed by cross-tail current reduction (current disruption) in
the near-Earth plasma sheet. This opens up the possibility for the occurrence
of triggering features associated with specific signatures during
substorm initiation and expansion. We present multi-scale fluctuation
signatures of some well-documented substorm events from the THEMIS
mission when the observations over multiple locations indicated the
occurrence of both mid-tail and near-Earth activations. Multi-scale methods
allow to identify the scales of energization and in combination with the
timing analysis lead to better description of energy redistribution during
substorms. |
|
|
|
|
|