Tracking of flare-generated interplanetary shock waves, responsible for Forbush decreases, by observing type-II radio bursts

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Forbush Decreases, Interplanetary Medium, Shock Wave Propagation, Solar Flares, Solar Terrestrial Interactions, Type 2 Bursts, Cosmic Ray Showers, International Sun Earth Explorer 3, Kilometric Waves, Radio Tracking, Solar Wind

Scientific paper

A more accurate identification of the solar flares responsible for Forbush decreases of galactic cosmic rays caused by flare-generated interplanetary shock waves, based on tracking type-II radio bursts, is presented. Nine solar flares observed between September, 1978, and December, 1979, generated shock waves which produced intensive type-II radio bursts observed in the hectometric and kilometric wave range by the ISEE-3 satellite. All the type-II shocks were responsible for Forbush decreases. Since the observation of type-II radio bursts permits the propagation of shock waves to be followed practically from the place where they are generated deep in the solar corona, through interplanetary space as far as earth, these observations provide the possibility of exact identification of Forbush decreases with the corresponding flares. These observations have also supplied a further dimension for analyzing interplanetary disturbances and forecasting Forbush decreases.

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