摘要
用取自１００°Ｅ和３００°Ｅ的两条地磁经度链附近１１个台站的１ｍｉｎ均值地磁资料，分析了１９９４年１１月２６日磁暴期间的磁扰特征，由Ｈ和ｚ分量演变得知。一区和二区场向电流的变化发展是碰层－电离层电动耦合中的重要过程，它们对于极光区和中低纬区电离层的作用效果有很大差异二在不同经度链上的影响也有所不同．耦合能量和二区场向电流的屏蔽效应使极光区电离层扰动电流突增，并使夜间中低纬区出现短时间的东向电流成分增加，其持续时间约为０．５ｈ．中低纬区夜间的东向电场又可通过Ｅ×Ｂ的垂直向上漂移作用抬升Ｆ层等离子体，从而出现同一经度链附近的多站ｈ’Ｆ同时突增现象．
Minutely mean values of geomagnetic data from each 11 stations nearby100°E GM and 300°E GM meridians respectively are used to analyze the detailedfeatures of magnetospheric disturbances during a magnetic storm on November 26,1994. It is shown by the evolutions of H- and z- components, that the variationso f both region 1 and region 2 field-aligned currents are very important processesin the magnet osphere- ionosp here coupling. T he coupli ng effect s in t he auror al areaare distinct obviously from that in mid-- and lowWelatitudes. And the influence degreefor stations along different meridians is neither the same. The disturbance energyfrom the magnetosphere and the shielding effect of the region 2 field--aligned currentmay cause an abrupt intensification of ionospheric currents, and an eastward fieldand current may appearg which could last for about half an hour, in mid- andlow-latitudes at night side. Meanwhile, ionospheric plasmas of the F-region will belifted by E x B drift effect, which then leads to a simultaneously enhancement of h'F(minimum vertual height for F-region) at many stations nearby a same meridian.
出处
《空间科学学报》
CAS
CSCD
北大核心
1999年第2期134-140,共7页
Chinese Journal of Space Science
基金
国家自然科学基金!49674245
关键词
磁层电离层耦合
极光区
中低纬区
地磁资料
Magnetosphere-ionosphere coupling, Field-aligned cursent, Au-roral ionosphere, Mid-and low-latitude ionosphere
