Abstract
We investigate the behavior of mean values of the solar wind’s and interplanetary magnetic field’s (IMF) parameters and their absolute and relative variations during the magnetic storms generated by various types of the solar wind. In this paper, which is a continuation of paper [1], we, on the basis of the OMNI data archive for the period of 1976–2000, have analyzed 798 geomagnetic storms with D st ≤ −50 nT and their interplanetary sources: corotating interaction regions CIR, compression regions Sheath before the interplanetary CMEs; magnetic clouds MC; “Pistons” Ejecta, and an uncertain type of a source. For the analysis the double superposed epoch analysis method was used, in which the instants of the magnetic storm onset and the minimum of the D st index were taken as reference times. It is shown that the set of interplanetary sources of magnetic storms can be sub-divided into two basic groups according to their slowly and fast varying characteristics: (1) ICME (MC and Ejecta) and (2) CIR and Sheath. The mean values, the absolute and relative variations in MC and Ejecta for all parameters appeared to be either mean or lower than the mean value (the mean values of the electric field E y and of the B z component of IMF are higher in absolute value), while in CIR and Sheath they are higher than the mean value. High values of the relative density variation sN/〈N〉 are observed in MC. At the same time, the high values for relative variations of the velocity, B z component, and IMF magnitude are observed in Sheath and CIR. No noticeable distinctions in the relationships between considered parameters for moderate and strong magnetic storms were observed.
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Original Russian Text © Yu.I. Yermolaev, I.G. Lodkina, N.S. Nikolaeva, M.Yu. Yermolaev, 2011, published in Kosmicheskie Issledovaniya, 2011, Vol. 49, No.1, pp. 24–37.
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Yermolaev, Y.I., Lodkina, I.G., Nikolaeva, N.S. et al. Statistical study of interplanetary condition effect on geomagnetic storms: 2. Variations of parameters. Cosmic Res 49, 21–34 (2011). https://doi.org/10.1134/S0010952511010035
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DOI: https://doi.org/10.1134/S0010952511010035