Flare-generated heliospheric and geomagnetic disturbances

Astronomy and Astrophysics – Astronomy

Scientific paper

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Heliosphere, Kp Index, Magnetic Disturbances, Solar Activity Effects, Solar Flares, Earth Magnetosphere, Interplanetary Magnetic Fields, Solar Terrestrial Interactions, Solar Wind Velocity

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Scientific paper

Abstract

The variation of important IMF parameters in the period from 2 d before to 6 d after solar flares of importance 2 or greater is investigated statistically on the basis of published observational data, applying the method of superposed epochs. The results are presented in tables and graphs, and it is found that only flares of importance 3 or 2 and duration 1.5 h or more produce significant IMF or geomagnetic disturbances. From the correlation of the east-west asymmetry of solar-wind velocity with the variation of the geomagnetic index AE and with the onset of moderate (Kp = 4.5) geomagnetic disturbances, and from the correlation of the asymmetry of the IMF intensity (especially in its southward component) with the distributions of the indices Dst and Ap and the onset of strong (Kp = 6) disturbances it is inferred that two distinct kinds of solar-wind/magnetosphere interactions may take place.

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