Abstract This work is a continuation of investigation [1] of the behavior of the solar wind’s and interplanetary magnetic field’s parameters near the onset of geomagnetic storms for various types of solar wind streams. The data of the OMNI base for the 1976–2000 period are used in the analysis. The types of solar wind streams were determined, and the times of beginning (onsets) of magnetic storms were distributed in solar wind types as follows: CIR (121 storms), Sheath (22 storms), MC (113 storms), and “uncertain type” (367 storms). The growth of variations (hourly standard deviations) of the density and IMF magnitude was observed 5–10 hours before the onset only in the Sheath. For the CIR-, Sheath-and MC-induced storms the dependence between the minimum of the IMF Bz-component and the minimum of the Dst-index, as well as the dependence between the electric field Ey of solar wind and the minimum of the Dst-index are steeper than those for the “uncertain” solar wind type. The steepest Dst vs. Bz dependence is observed in the Sheath, and the steepest Dst vs. Ey dependence is observed in the MC.


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    Title :

    Statistical investigation of Heliospheric conditions resulting in magnetic storms: 2


    Contributors:

    Published in:

    Publication date :

    2007




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    50.93 Weltraumforschung / 39.00 Astronomie: Allgemeines / 55.60 Raumfahrttechnik
    Local classification TIB:    770/3520/8000



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    Statistical investigation of Heliospheric conditions resulting in magnetic storms: 2

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