Repetitive substorms caused by Alfvénic waves of the interplanetary magnetic field during high-speed solar wind streams

Details Repetitive substorms caused by Alfvénic waves of the interplanetary magnetic field during high-speed solar wind streams Repetitive substorms caused by Alfvénic waves of the interplanetary magnetic field during high-speed solar wind streams

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11112214l&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A12, CiteID A12214

Physics

6

Magnetospheric Physics: Substorms, Magnetospheric Physics: Magnetic Storms And Substorms (7954), Interplanetary Physics: Corotating Streams, Magnetospheric Physics: Plasma Convection (2463)

Scientific paper

Substorms sometimes occur repetitively with a period of ~1-4 hours. In this paper we examine repetitive substorms, identified using particle injections and positive H bays on the nightside, that we find to occur during corotating high-speed streams associated with coronal holes. The high-speed streams often last for several days and are accompanied by large amplitude Alfvén waves of the interplanetary magnetic field (IMF). We find that repetitive substorms occur every ~1-4 hours, regardless of the solar cycle phase, whenever the Earth's magnetosphere is impinged by these high-speed streams. We further find that a significant number of these substorms are associated with repetitive northward turnings of the Alfvénic IMF, each northward turning preceded by weakly-to-moderately southward IMF, i.e., Bz ~ -3.6 nT for ~29 min on the average. We present eight example intervals where most of the repetitive substorms were associated with a northward turning. Statistically, for 63.5% of 312 substorms we are able to identify a reasonable association with a northward turning. While limitations of the Weimer-mapped IMF used here and the spatial structure of the Alfvénic IMF prevent us from estimating a precise figure for the percentage of IMF triggered substorms, our results indicate that many of the repetitive substorms are likely due to repetitive triggering by the Alfvénic IMF.

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