Solar Wind Electric Field and Predictability of the Dst Index

Details Solar Wind Electric Field and Predictability of the Dst Index Solar Wind Electric Field and Predictability of the Dst Index

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42a0832b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM42A-0832

Physics

2700 Magnetospheric Physics, 2722 Forecasting, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

An accurate prediction of the ring current strength and the Dst index can be computed by the Burton et al. (J.G.R., 80, 4204, 1975) formula, that is based on the solar wind upstream conditions. This formula includes in particular one term of ring current variation that corresponds to the injection due to interplanetary-magnetospheric reconnection and the related electric field. In the present study we have calculated the Dst predictions, over the years 1995-2000, considering the two cases in which the electric field involved is the rectified solar wind electric field for southward interplanetary magnetic field, DstB, or the meging electric field, DstE. The comparison among these Dst predictions and the observed Dst shows that DstE is representing the observed Dst equally or better than DstB. In particular, when the interplanetary magnetic field clock angle is around +/-90° the DstE is more disturbed than the DstB. These results are interpreted in terms of the higher reconnection rate expressed by the merging electric field that takes into account the interplanetary-geomagnetic reconnection occurring at the lobes of the magnetosphere.

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