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| Titel |
A statistical study of the Bz-dips in front of magnetotail dipolarization fronts |
| VerfasserIn |
Daniel Schmid, Martin Volwerk, Rumi Nakamura, Wolfgang Baumjohann, Ferdinand Plaschke |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103874
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| Publikation (Nr.) |
 EGU/EGU2015-3295.pdf |
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| Zusammenfassung |
| Dipolarization fronts (DF) are a key ingredient of magnetic flux transport in the magnetotail towards Earth. They are accompanied by fast flows, also called bursty bulk flows (BBFs), and a sharp increase in the magnetic field Z-component perpendicular to the current sheet in the tail. That increase in Bz is typically preceded by a decrease, a Bz-dip, which sometimes even turns negative.
We present a study on the depth of the Bz-dips with respect to DF -characteristics, -geometry and location in the tail. For our study, we use a comprehensive DF-list introduced in Schmid et al.(doi:10.1002/2014JA020380), which is based on 9 years (2001-2009) of Cluster magnetotail observations.
Relative to the Bz change across the DF, we find the Bz-dip depth, to be independent of the distance to the centre of the neutral sheet. However, in azimuthal direction the Bz-dip is more pronounced at the DF centre. We relate these results to the current systems and density distribution on and in the vicinity of DFs. |
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