不同类型磁暴和中低纬电离层暴的关系

分析了快速强主相和延迟弱主相磁暴期间中低纬电离层大尺度扰动形态．结果表明，对于这两种不同类型的磁暴，电离层负相扰动区的影响范围和形态也有差异．强主相磁暴情况下的负相区渗透到较低纬度，影响范围大；而弱主相施暴，负相限于纬度较高地区，影响范围较小．负相的开始和结束时间与磁暴主相延迟时间有着很好的对应．对于主相快速发展的磁暴，负相扰动的出现较快．而当磁暴主相长时间延迟时，电离层中也相应地出现负相长时间延迟．结果反映了按Ｋｐ指数对磁暴类型的分类对中低纬电离层暴的扰动形态分析也有着重要意义．

MID-AND LOW-LATITUDE IONOSPHERIC RESPONSES TO DIFFERENT TYPE OF MAGNETIC STORM

Using the ionosonde data of 12 stations at East Asia,the responses of mid-and low-latitude ionosphere to two types of geomagnetic storms,i.e.instantaneous intense main phase and delayed weak main phase storms were analyzed.The results show that magnetic storm with intense main phase causes ionospheric storm with negative phase that spreads to the larger area towards low-latitude than those caused by the magnetic storm with weaker main phas The main phase delay after SSC corresponds to the delay of commencement of ionospheric storm with negative phase.The results above may suggest that the classificatlon of magnetic storm in terms of Kp is also valid for the classificatlon of ionospheric storm.