THEMIS observations of an earthward-propagating dipolarization front
Article first published online: 29 JUL 2009
Copyright 2009 by the American Geophysical Union.
Geophysical Research Letters
Volume 36, Issue 14, July 2009
How to Cite
2009), THEMIS observations of an earthward-propagating dipolarization front, Geophys. Res. Lett., 36, L14106, doi:10.1029/2009GL038980., , , , , , , , and (
- Issue published online: 29 JUL 2009
- Article first published online: 29 JUL 2009
- Manuscript Accepted: 26 JUN 2009
- Manuscript Revised: 22 JUN 2009
- Manuscript Received: 30 APR 2009
- plasma sheet;
 We report THEMIS observations of a dipolarization front, a sharp, large-amplitude increase in the Z-component of the magnetic field. The front was detected in the central plasma sheet sequentially at X = −20.1 RE (THEMIS P1 probe), at X = −16.7 RE (P2), and at X = −11.0 RE (P3/P4 pair), suggesting its earthward propagation as a coherent structure over a distance more than 10 RE at a velocity of 300 km/s. The front thickness was found to be as small as the ion inertial length. Comparison with simulations allows us to interpret the front as the leading edge of a plasma fast flow formed by a burst of magnetic reconnection in the midtail.