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| Titel |
Ion temperature in pre- and post-dipolarization plasma sheets |
| VerfasserIn |
Daniel Schmid, Martin Volwerk, Zoltan Voros, Pete Boakes, Rumi Nakamura, Mingyu Wu, Steve Milan |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250073148
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| Zusammenfassung |
| Using the ECLAT event list of magnetotail dipolarizations, limited to the cases that were
presented in Schmid et al. [2011], we study the ion temperature and its anisotropy
(i.e. T-¥-T-¥) in the pre- and post-dipolarization plasma sheets in the Earth’s magnetotail.
Earlier studies have shown that in the quiescent magnetotail the ion temperature is isotropic,
however, during fast flow times there is a strong anisotropy. Lately it has been shown, using
THEMIS data, that this anisotropy in the magnetotail is structured in (T-¥-T-¥,
β-¥)-space, strongly bound by temperature anisotropy driven instability thresholds (mirror
mode, ion cyclotron mode and fire hose instability), and that the ion temperature
isotropizes as the flow moves Earthward [Wu et al., 2012, submitted to JGR]. In this
study, superposed epoch analysis is performed on the events, where a split-up is
made into local time sectors and on pre-dipolarization plasma sheet characteristics. |
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