日侧极隙纬度低频波及其与地磁扰动的关系

ELF/VLF EMISSIONS AT DAYSIDE CLEFT LATITUDES AND CORRELATIVITIES OF THEM WITH GEOMAGNETIC DISTURBANCES

利用挪威斯瓦尔巴德地区的ＥＬＦ／ＶＬＦ观测资料和世界数据中心公布的Ｋｐ指数，分析了日侧极隙纬度低频波不同季节里的周日变化和１９８４年５月－１９８６年４月的年度变化及这些波与地磁扰动的某些关系．主要结果有：１．夏季ＥＬＦ波出现率极大值最大，而冬季的最小，前者约为后者的３倍，而且此极大值无论哪个季节都出现在磁正午时段．２．ＶＬＦ波出现率在夏季较小冬季较大；其极大值出现在磁午后至磁子夜前的２－４ｈ时段里．３．夏季ＥＬＦ波指数∑Ａ与地磁指数∑ＫＰ日变化较相吻合，在太阳自转周内两者相关系数约为０．６．４．冬季ＶＬＦ波指数∑Ａ与∑Ｋｐ日变化相吻合，在太阳自转周内两者相关系数可达０．８．这些结果表明日侧极隙纬度ＥＬＦ波和ＶＬＦ波各有不同的产生机制和源区．

The data of ELF/VLF emissions on the Svalabard archipelago are introduced.The average diurnal variation of cleft ELF/VLF emissions for different seasons and the annual variations of them from May 1984 to April 1986,and the correlativities of the dayside cleft ELF/VLF emissions with the geomagnetic disturbances have been calculated.The statistical studies between the ELF/VLF emissions and geomagnetic indexes ∑Kp during the years 1984-1987 have been carried out. Some correlations of ELF emissions in summer and of VLF emissions at all seasons,respectively,with geomagnetic indexes ∑KP are presented.