 |
| Titel |
Do flow bursts penetrate into the inner magnetosphere? |
| VerfasserIn |
Stepan Dubyagin, Victor Sergeev, Vassilis Angelopoulos, Andrey Runov, Rumi Nakamura, Wolfgang Baumjohann, Natalia Ganushkina, James McFadden, Davin Larson |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055192
|
|
|
|
|
|
| Zusammenfassung |
| Recent studies have shown that only a small part of the fast flow bursts observed at mid-tail
penetrate into the inner magnetosphere, rising questions regarding their role for particle
injections. Motivated by these findings we compared observations at two radially aligned
spacecraft in the high-beta nightside plasma sheet to investigate which physical parameter
controls the penetration efficiency of the flow burst observed at the outer spacecraft. We
showed that the inferred plasma tube entropy PV 5-3 demonstrates the best prediction
efficiency compared to other parameters (e.g. V x or Bz). Its minimal value at the outer probe
during the flow burst compared to its preflow value at the inner probe is able to discriminate
between “penetrating” and “non-penetrating” events. Our results give an explanation
for the relatively small fraction of deeply penetrating BBFs and provide a strong
argument in favor of the bubble model of fast flow bursts and plasma injections. |
|
|
|
|
|
|