【摘要】 利用通海地磁台 ( L=1 .0 3) 1 999年 SMALL磁通门磁力仪记录资料 ,对 Pc3脉动出现率的统计结果表明 ,日出现频次有两个峰值 ,即清晨 0 6:0 0～ 0 7:0 0 LT(地方时 )出现频次最高 ,午后 1 4:0 0～ 1 5 :0 0 LT为次峰值。Pc3脉动月出现频率最高的是 4月和 1 2月 ,其次是 8月和9月 ;最少的是 6月和 7月。按季节统计结果为春秋季出现频次最高 ,冬季次之 ,夏季最低更多还原

【Abstract】 Using the data which produced by the fluxgate geomagmeter of SMALL project at Tonghai( L =1 03)observatory in 1999,we made a statistic estimate to the occurrence of the Pc3 pulsation.The result shows that the daily occurrence rate have two peak values,the highest one is at 06:00～07:00 LT and the other is at 14:00～15:00 LT.The highest value of the monthly occurrence rate of Pc3 pulsation is April and December,in the next place is August and September;the June and July have the least value.The seasonal occurrence rate of Pc3 from most to least is equinox,winter and summer.更多还原