Solar wind density as a driver for the ring current in mild storms

Details Solar wind density as a driver for the ring current in mild storms Solar wind density as a driver for the ring current in mild storms

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1797s&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 13, p. 1797-1800

Physics

9

Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Storms And Substorms

Scientific paper

Using the methods of multi- and partial-linear-correlation, we demonstrate that both the solar wind density and the solar wind electric field make significant and independent contributions to the strength of the ring current, as measured by the Dst* index, during mild storms. The solar wind data were obtained from WIND, and the Dst data from OmniWeb. After appropriate cleaning of the data, 55 events from the Wind-era with Dst* excursions below -50 were obtained. Correlations with Dst* were performed with independent, variable time lags for the density and for the electric field, and the optimal time lags are found to be approximately 5 hours for density and less than one hour for the electric field (in addition to the time shift to Earth).

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