Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.506..121c&link_type=abstract
In: Solar variability: from core to outer frontiers. The 10th European Solar Physics Meeting, 9 - 14 September 2002, Prague, Cze
Physics
Solar Wind, Geomagnetic Storms
Scientific paper
Trying to get light in the paradigm of forecasting geomagnetic activity, we have tried to explain the physical processes that are involved in the interaction of magnetic clouds and the terrestrial ring current. This ring current consists of energetic charged particles flowing toroidally around the Earth. Changes in this current are responsible for global decreases in the Earth's surface magnetic fields, which is the defining feature of geomagnetric storms. In order to check our theoretical results, we have related the geomagnetic storms of years 1995-2000 (from minimum to maximum activity) with its precursor in the solar wind. When we have identified a MC as the solar wind precursor we have analyzed the solar wind even using a model that we have previously developed and that provides the orientation of its helicity. We have related these physical parameters (and others from the solar wind) with Dst index, as a geoeffectiveness indicator. On the basis of the results obtained, we show that there is close relationship between the helicity and orientation of a magnetic cloud, and the geoeffectiveness of the event.
Cerrato Y.
Cid Carlos
Hidalgo M. A.
Medina Julieta
Nieves-Chinchilla Teresa
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