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Occurrence rate of earthward-propagating dipolarization fronts
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.ORCID iD: 0000-0003-1654-841x
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.
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2012 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 39, article id L10101Article in journal (Refereed) Published
Abstract [en]

The occurrence rate of earthward-propagating dipolarization fronts (DFs) is investigated in this paper based on the 9 years (2001-2009) of Cluster 1 data. For the first time, we select the DF events by fitting the characteristic increase in B-z using a hyperbolic tangent function. 303 earthward-propagating DFs are found; they have on average a duration of 4 s and a B-z increase of 8 nT. DFs have the maximum occurrence at Z(GSM) approximate to 0 and r approximate to 15 R-E with one event occurring every 3.9 hours, where r is the distance to the center of the Earth in the XYGSM plane. The maximum occurrence rate at Z(GSM) approximate to 0 can be explained by the steep and large increase of B-z near the central current sheet, which is consistent with previous simulations. Along the r direction, the occurrence rate increases gradually from r approximate to 20 to r approximate to 15 R-E but decreases rapidly from r approximate to 15 to r approximate to 10 R-E. This may be due to the increasing pileup of the magnetic flux from r approximate to 20 to r approximate to 15 R-E and the strong background magnetic field at r <similar to 13 R-E, where the magnetic field changes from the tail-like to dipolar shape. The maximum occurrence rate of DFs (one event per 3.9 hours) is comparable to that of substorms, indicating a relation between the two.

Place, publisher, year, edition, pages
2000 Florida Ave NW Washington, DC 20009, USA: American Geophysical Union (AGU), 2012. Vol. 39, article id L10101
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Physical Sciences
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URN: urn:nbn:se:kth:diva-253254DOI: 10.1029/2012GL051784ISI: 000304560600004Scopus ID: 2-s2.0-84861676233OAI: oai:DiVA.org:kth-253254DiVA, id: diva2:1324656
Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-06-18Bibliographically approved

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Fu, HuishanKhotyaintsev, Yuri V.Vaivads, AndrisAndré, Mats

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