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地磁静日期内北半球电离层N_mF_2的结构分布
Alternative TitleSTRUCTURE DISTRIBUTION OF N_mF_2 IN THE IONOSPHERE OF THE NORTHERN HEMISPHERE DURING A GEOMAGNETICALL QUIET PERIOD
沈长寿; 资民筠; 王劲松; 徐寄遥; 北京8701信箱
Department空间天气学国家重点实验室
Source Publication地球物理学报
2003
Volume46Issue:6Pages:731-735
ISSN0001-5733
Language中文
Keyword电离层nmf2的结构分布 纬度剖面 经度效应 F层赤道异常的“驼峰”
Abstract北半球陆地上48个地面电离层垂测站资料 ,以及国际参考电离层IRI 90模式 ,考察 1985年1月6~ 7日F2 层电子密度最大值日变化的纬度剖面和经度效应 .结果表明 ,在亚洲地区的 2 0°N~ 30°N内 ,F2 层赤道异常“喷泉效应”产生的NmF2 “北驼峰”最高 ,其最大值出现在中午 ,或稍迟时间 .30°N~ 50°N区域内 ,NmF2 的白天峰值幅度逐渐下降 ,峰值时间移至午前约 10 :0 0LT .更高纬度 (50°N~ 62°N )台站上 ,中午前后NmF2 出现双峰 ,傍晚有谷值 ,夜间又再次抬升 .欧、美地区的低纬台站很少 ,但借助IRI 90模式分析可发现 ,在 270°E经圈上 ,“喷泉效应”造成的“北驼峰”幅度最小 ,而且随纬度增大时 ,NmF2 白天幅度下降也不明显 ,即纬度剖面的经度效应非常显著 .对中国、日本地区台站资料的小范围经度差异分析表明 ,在驼峰区的90°E~ 140°E内 ,各站NmF2 无明显差别 ;但在中纬地区30°N~ 50°N内 ,中国西部上空NmF2 白天变化幅度较大 ,且较为陡直 ,而中国东部和日本台站上空则相对平缓 .
Other AbstractUsing the data from 48 ionosondes in the Northern Hemisphere and the model of IRI-90, the latitude profiles of variations of N mF 2 on Jan. 7, 1985 at sunspot minimum are investigated. The results show that for the F 2 layer equatorial anomaly the “fountain effect” is strongest at Asia region and the “northern crest” at (20°N~30°N) is highest with a maximum value of N mF 2 at noon, or a bit later. At the range of 30°N~50°N the F 2 peaks decrease gradually and the peak times move to about 10:00 LT, while in the high latitude region (50°N~62°N)two peaks appear around noon,followed by a valley at dusk and the peak values increase again during the night.There are very few ionosondes at low latitude in the European and American regions.Never。theless,using the mod el of IRI.90,it Can be still found that the northern “crest” produced by the “fountain efect”is weakest at longitude 270。E.Th edecrease of da~ime F2 peaks at higher latitude is not evident in these regions.It means that the longitude change of latitude profiles of N F2 diurnal variations is obvious·On the other hand.analysis of data measured by ionosondes in China and Japan (in a narrower range of longitude)shows that N F2 diurnal variations in the region of 90。E~140。E has no great longitude difference.or so.called longitude efect,at“crest”region(20。N~30。N).However,at middle latitude(30°N~50°N)the variation amplitudes of N F2 are larger and steeper in the west of China than that in the east of China and Japan·
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1189
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
沈长寿,资民筠,王劲松,等. 地磁静日期内北半球电离层N_mF_2的结构分布[J]. 地球物理学报,2003,46(6):731-735.
APA 沈长寿,资民筠,王劲松,徐寄遥,&北京8701信箱.(2003).地磁静日期内北半球电离层N_mF_2的结构分布.地球物理学报,46(6),731-735.
MLA 沈长寿,et al."地磁静日期内北半球电离层N_mF_2的结构分布".地球物理学报 46.6(2003):731-735.
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