Abstract
For a comprehensive study of the Forbush effects and their relation to solar and geomagnetic activity, a database of transient phenomena in cosmic rays and the interplanetary medium has been created, which is continuously updated with data on new events. Based on these data, we study the dependence of the Forbush effects on various internal and external parameters, as well as select different groups of events. In this paper, we consider recurrent (caused by high-speed solar wind streams from coronal holes) and sporadic (associated with coronal mass ejections) events. We investigate groups of events with a sudden and gradual onset. We show that the resulting dependencies of the Forbush effects (on the parameters of interplanetary disturbances, geomagnetic activity indices, etc.) are substantially different for the above-mentioned groups. Most likely, these differences are caused by different sources of solar wind disturbances.
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Original Russian Text © A.A. Abunin, M.A. Abunina, A.V. Belov, E.A. Eroshenko, V.A. Oleneva, V.G. Yanke, 2012, published in Geomagnetizm i Aeronomiya, 2012, Vol. 52, No. 3, pp. 313–320.
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Abunin, A.A., Abunina, M.A., Belov, A.V. et al. Forbush effects with a sudden and gradual onset. Geomagn. Aeron. 52, 292–299 (2012). https://doi.org/10.1134/S0016793212030024
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DOI: https://doi.org/10.1134/S0016793212030024