Fast Analysis of the Solar Wind Energy

摘要

The solar wind energy injected into the magnetosphere may be evaluated by means of the AE-index of the geomagnetic activity. However, these indexes are underestimated for the disturbed periods and available too late to be efficiently used. For a fast analysis, daily sums of the differences between the mean hourly values of horizontal component and the corresponding mean hourly values of H on five international quiet days have been used instead of the AE-index. These sums were calculated from the data of mid-latitude observatories. They have a high correlation with the corrected AE-indexes for the quiet and disturbed periods. Using these sums, the solar wind energy injected into the magnetosphere was estimated for the years 1953-2001 as the daily, monthly and yearly values. It is shown that the energy increased with increasing solar and magnetic activity. At some cycles of the solar activity, the increase of the injected energy continued for several years on the descending phases of cycles and at some cycles the injected energy and solar activity have changed their phase.