Occurrence rate of earthward‐propagating dipolarization fronts
作者： HS Fu , Yuri V Khotyaintsev , Andris Vaivads , Mats André , SY Huang
DOI: 10.1029/2012GL051784
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摘要: [1] The occurrence rate of earthward-propagating dipolarization fronts (DFs) is investigated in this paper based on the 9 years (2001–2009) Cluster 1 data. For first time, we select DF events by fitting characteristic increase inBzusing a hyperbolic tangent function. 303 DFs are found; they have average duration 4 s and aBz 8 nT. maximum at ZGSM ≈ 0 r 15 RE with one event occurring every 3.9 hours, where distance to center Earth XYGSM plane. The can be explained steep large Bz near central current sheet, which consistent previous simulations. Along direction, increases gradually from 20 but decreases rapidly 10 RE. This may due increasing pileup magnetic flux strong background field <∼13 RE, changes tail-like dipolar shape. (one per hours) comparable that substorms, indicating relation between two.
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