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| Titel |
Do high-speed plasma sheet flows contribute to inner magnetosphere dipolarisation? : A multi year statistical study using multi-spacecraft observations |
| VerfasserIn |
Roger Duthie, Andrew Fazakerley, Colin Forsyth, Andrew Walsh, Iannis Dandouras, Elizabeth Lucek, Tielong Zhang |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250053325
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| Zusammenfassung |
| In the plasma sheet of Earth’s magnetotail, magnetic flux is frequently transported via
intermittent, high-speed flows – termed “bursty bulk flows” (BBFs). Dipolarisation of the
distended magnetic field pervading the night-side magnetosphere is also common. Both of
these phenomena play a role in Earth’s substorm cycle.
Previous studies have examined concurrent observations of BBF & dipolarisation events to
seek evidence of a direct connection between BBFs & dipolarisations. Ohtani et al. (2006)
performed a statistical analysis using Geotail & GOES data from 1993 to 2001. They
concluded that the majority of cases showed no direct connection of BBF occurrence &
dipolarisation at the geosynchronous orbit. Takada et al. (2006) did a similar study
of concurrent observations made by one Cluster spacecraft and one Double Star
spacecraft, using data from 2004. With this study, dipolarisations observed in the
near-geosynchronous region (X > -8Re) were never associated with an observed
BBF.
The current work follows a similar line to Takada et al., though considers a larger set of
events and uses all Cluster & Double Star spacecraft as appropriate to forming multi-point
conjunctions in the magnetotail; the best possible utilisation of multi-spacecraft measurement
has been attempted. This study seeks to answer questions raised by Ohtani et al. & Takada et
al., such as whether BBFs of the near-Earth tail are ever associated with inner magnetosphere
dipolarisation. |
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