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Geoeffectiveness of Halo CMEs during different phases of solar activity cycle 23

机译：太阳活动周期不同阶段的Halo CME的地球有效性23

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We studied the geoeffectiveness of a set of 397 halo CMEs during the ascending, maximum and descendi descending phases of ng solar cycle 23. In this study minimum Dst values occurring within 1 1-5 days after the CME onset are compiled. The distribution of such Dst values are compared for the following categ categories of halo CMEs disk halos limb halos and backside halo CMEs. We defined ries that these halo CMEs are geoeffective if it is followed by Dst 凾 -50 nT, mode moderately geoeffective if ately -50n < Dst < -100 nT, and strongly geoeffective if Dst 凾 -100 nT. We find that Disk halos are followed by strong storms, limb halos are followed by moderately storms and backside halos are about near to moderate storms. The Frontside halos (Disk +F F-limb) are most geoeff geoeffective (~71%). ective Intense storms are o occurred in maximum phase of solar cycle and the few are occurred in declining phase. Most intense storms occur, curred when there are successive CMEs and occurred near the disk center towards western hem hemisphere. The long term pr sphere. profile of Dst index is ofile positively related with CME occurrence rate. Most of the geoeffective halos are confined between the maximum and descending phases. The delay time between CME onset and minimum Dst values is the smallest for Limb halos. Most of the g geoma eomagnetic storms netic are occurred between 48 hours to 72 hours after CME onset.
机译：我们研究了一组397个晕CME在ng太阳周期23的上升，最大和下降阶段的地球有效性。在这项研究中，汇编了CME发作后1到1天内的最小Dst值。对于以下类别的光晕CME，磁盘光晕，肢体光晕和背面光晕CME，比较了Dst值的分布。我们定义为，如果这些CME紧随其后是Dst凾-50 nT，则其为地球有效；如果-50n

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