A threshold for solar wind density in controlling the development of the main phase of a geomagnetic storm?

Details A threshold for solar wind density in controlling the development of the main phase of a geomagnetic storm? A threshold for solar wind density in controlling the development of the main phase of a geomagnetic storm?

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41a2011l&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM41A-2011

Physics

[7954] Space Weather / Magnetic Storms

Scientific paper

The solar wind at the L1 point has to reach the magnetosphere before having an interaction with the magnetosphere and producing a geophysical effect. Using high time resolution of geomagnetic data and solar wind data and considering the delayed geoeffectiveness of solar wind, we analyzed the interplanetary sources for 4 intense geomagnetic storms. The results show that there is seemly a threshold for the solar wind density. When solar wind density is lower than the threshold, the solar wind will not make contribution to the development of the main phase of a geomagnetic storm, even in the presence of a sustained strong southward interplanetary magnetic field, or a sustained strong solar wind electric field.

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