赤道电射流的影响范围

本文收集了１９８２年３月印度、中国、菲律宾低纬地区９个地磁台的静日月均值资料。经分析对比后绘出了Ｓｑ（Ｈ），Ｓｑ（Ｚ）变幅与离磁赤道距离的关系图。结果显示赤道电射流对Ｓｑ（Ｚ）的影响可达５００ｋｍ，对Ｓｑ（Ｈ）的影响范围小于４００ｋｍ。这个结果与ＰＡＲＫＩＮＳＯＮ（１９８３）书中的论述基本一致。离磁赤道远达１０００ｋｍ的琼中台资料没受赤道电射流的影响，广州台资料则更不可能受影响。

Latitude range of the equatorial electrojet effect

The writer collected the geomagnetic Sq variation data of March,1 982 for 9 Mag- netic observatiories located in the low-latitude region of lndia,China and Philippine. The daily ranges of Sq(H)and Sq(Z) are plotted against the distances between the station and the magnetic equator. The resuIts indicate that the influence of equatorial electrojet on Sq(Z)can be found at a site of 500 km and the influence on Sq(H)appears in a rangeless than 400 km. This feature is basically in agreement with that described in the text book written by PARKINSON(1983).Consequently,the Sq data of the Qiongzhongobservatory,Iocated l 000 km away from the magnetic equator,do not affected by theequatorial electrojet,and the Sq data of the Guangzhou observatory certainly get rid ofthe influence of equatorial electrojet.