Dynamics of magnetospheric current systems during magnetic storms of different intensity |
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| Authors: | V V Kalegaev E V Makarenkov |
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| Institution: | (1) Skobeltsyn Institute of Nuclear Physics, Moscow State University, 1-2, Vorob’evy Gory, GSP-2, Moscow, 119992, Russia |
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| Abstract: | The dynamics of the magnetospheric magnetic field during the magnetic storms of different intensity has been studied. The magnetic field variations on the Earth’s surface were calculated using the paraboloid model of the magnetosphere, taking into account the induction currents flowing in the diamagnetically conductive Earth. Dst and its components have been calculated for ten magnetic storms. It has been indicated that relative contributions of magnetospheric sources to Dst change depending on the storm power. For weak and moderate storms, the contribution of the magnetotail current sheet can reach values comparable with the ring current contribution and, sometimes, can even exceed this contribution. For strong storms, the ring current field dominates over the tail current field, the absolute value of which does not exceed 150 nT (also achieved during less intense storms). For storms with minimum Dst exceeding-200 nT, the tail current field is saturated, whereas the ring current can continue developing. |
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