On the geomagnetic response to high speed solar wind streams

Details On the geomagnetic response to high speed solar wind streams On the geomagnetic response to high speed solar wind streams

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8915851f&link_type=abstract

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Computer Science

Geomagnetism, Hysteresis, Solar Corpuscular Radiation, Solar Wind, Cosmic Plasma, Interplanetary Magnetic Fields, Interplanetary Medium, Space Plasmas

Scientific paper

Sixty high speed solar wind streams coming from coronal holes are analyzed grouping the events in three classes according to their time duration. For each class the average 24 hr profile of the interplanetary parameters (magnetic field magnitude B, solar wind bulk speed V, proton density Np, temperature Tp, total pressure P = Np KTp + B2/8 micron and dynamic pressure Pd = mpNpV2) and the geomagnetic indices are obtained. The statistical reliability of these signals is evaluated by means of the two-way analysis of variance; the general features of these signals are discussed. During these streams the time dependence of the geomagnetic index values on a single interplanetary parameter shows an hysteresis-like behavior. It is shown that a single interplanetary parameter is not sufficient to predict the complete geomagnetic perturbation and a combination of at least two variables is necessary.

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