大西洋低纬度Acsension IS台站强区域型扩展F发生率统计研究  

Statistical Study on the Occurrence of Strong Range Spread F Observed at Acsension IS Station in the Low Latitude Region of Atlantic Ocean

作　　者：王铮[1] 史建魁[1,2] 王国军[1] 王霄[1] 

机构地区：[1]中国科学院国家空间科学中心空间天气学国家重点实验室,北京100190 [2]中国科学院大学地学院,北京100049

出　　处：《科学技术与工程》2017年第10期114-118,共5页Science Technology and Engineering

基　　金：国家自然科学基金(41604137;41674145;41474137);国家重点实验室专项基金资助

摘　　要：使用位于南半球大西洋的低纬度Acsension IS台站(7.9°S,345.6°E;磁纬2.3°S)的DPS型数字测高仪在2004年探测的扩展F数据,对该台站上空的电离层扩展F、特别是强区域型扩展F的发生率特性进行统计研究。结果表明:探测到的扩展F类型是频率型(FSF)、区域型(RSF)、强区域型(SSF)和混合型(MSF),没有探测到歧型。各种类型扩展F的月变化不同,RSF与SSF的月发生率大致在1~3月和10~12月较高,在5~8月明显降低;不过SSF在7月和9月发生率也较高。各季节SSF占扩展F出现时间的比例在春秋季和夏季高(约30%),在冬季低(5%)。扩展F发生率峰值的地方时出现的顺序依次是RSF、SSF、FSF和MSF。通过将Ascension IS台站的扩展F,特别是SSF的变化规律与其他台站的结果进行比较,发现Acsension IS台站的扩展F,特别是SSF发生率的季节变化与其他经度地区台站以往的结果不完全相同,显示了电离层现象的区域变化特性,并说明SSF应被当做低纬度电离层一种独立的扩展F类型进行研究。With data in 2004 from Digisonde at Acsension IS station（ 7. 9°S,345. 6°E; Magnetic 2. 3°S） in the low latitude region of Atlantic Ocean in the Southern Hemisphere,the occurrence features of spread F,especially strong range spread F,were statistically studied. The results showed： the types of spread F observed were frequency spread F（ FSF）,range spread F（ RSF）,strong range spread F（ SSF） and Mixed spread F（ MSF）,no branch spread F. The monthly variation of each type of spread F was different,the occurrences of RSF and SSF were higher from January to March and from October to December,and decreased from May to August,while the occurrence of SSF was still high in July and September. The percentage of duration for SSF was high in summer and equinoxes（ near 30%）,and low in winter（ 5%）. The order of the peak occurrence local time were RSF,SSF,FSF and MSF. Compared with results at other stations,it showed that the seasonal variation of the spread F（ especially SSF） occurrence was not the same to features at other longitude stations,indicating the regional features of ionospheric phenomenon,implying the SSF should be considered as an independent type of spread F to be studied.

关 键 词：低纬电离层 扩展F 数字测高仪 区域特性 赤道等离子体泡 

分 类 号：P352.5[天文地球—空间物理学]