期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 13, 页码 6687-6693出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069693
关键词
SAPS onset timing; westward traveling surge
资金
- Air Force Office of Scientific Research
We present multispacecraft observations in the magnetosphere and conjugate ionosphere of the onset time of subauroral polarization streams (SAPS) and tens ofkeV ring current injections on the duskside in three individual substorms. This is probably the first unequivocal determination of the substorm SAPS onset timing. The time lag between the SAPS and substorm onsets is much shorter than the gradient-curvature drift time of approximate to 10keV ions in the plasmasphere. It seemingly depends on the propagation time of substorm-injected plasma from the dipolarization onset region to the plasmasphere, as well as on the SAPS position. These observations suggest that fast onset SAPS and ring current injections are causally related to the two-loop system of the westward traveling surge.
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