Two-step development of geomagnetic storms

Details Two-step development of geomagnetic storms Two-step development of geomagnetic storms

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.6917k&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A4, p. 6917-6922

Physics

76

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Storms And Substorms

Scientific paper

Using the Dst index, more than 1200 geomagnetic storms, from weak to intense, spanning over three solar cycles have been examined statistically. Interplanetary magnetic field (IMF) and solar wind data have also been used in the study. It is found that for more than 50% of intense magnetic storms, the main phase undergoes a two-step growth in the ring current. That is, before the ring current has decayed significantly to the prestorm level, a new major particle injection occurs, leading to a further development of the ring current, and making Dst decrease a second time. Thus intense magnetic storms may often be the result of two closely spaced moderate storms. The corresponding signature in the interplanetary medium is the arrival of double-structured southward IMF at the magnetosphere.

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