Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 33, issue 10
Articles | Volume 33, issue 10
https://doi.org/10.5194/angeo-33-1301-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-33-1301-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 33, issue 10
Regular paper
 | 
26 Oct 2015
Regular paper |  | 26 Oct 2015

A physical explanation for the magnetic decrease ahead of dipolarization fronts

Z. H. Yao, J. Liu, C. J. Owen, C. Forsyth, I. J. Rae, Z. Y. Pu, H. S. Fu, X.-Z. Zhou, Q. Q. Shi, A. M. Du, R. L. Guo, and X. N. Chu

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Short summary
We use THEMIS large data set of dipolarization front events to build a 2-D pressure distribution in XZ plane, and thus derive the current system around the dipolarization front. Our results show that a banana current loop is formed around the dipolarization front. This current is also suggested to be the reason for the magnetic dip observed ahead of the dipolarization front. In addition, the current density is too small to contribute a substorm current wedge.
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