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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Spatial Features of L-Band Equinoctial Scintillations From Equator to Low Midlatitude at Around 95°E During 2015–2016
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Spatial Features of L-Band Equinoctial Scintillations From Equator to Low Midlatitude at Around 95°E During 2015–2016

机译：l波段的空间特征二分从赤道低中间纬度在闪烁2015 - 2016年期间95°E

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摘要

The nature and extent of the irregularities causing L-band nighttime scintillations at a group of five stations Dibrugarh (27.5°N, 95°E, 43° dip), Kohima (25.6°N, 94.1°E, 39° dip), Aizawl (23.7°N, 92.8°E, 36° dip), Port Blair (11.6°N, 92.7°E, 9° dip), and Cocos Islands (12.2°S, 96.8°E, 43° dip) from the northern low midlatitudes to southern midlatitudes along 95°E meridian is investigated. Global Navigation Satellite System/Global Positioning System/ionosonde measurements during the equinoctial months of 2015–2016 have been utilized. The northernmost station Dibrugarh and the southernmost station Cocos Islands are magnetically conjugate. Scintillations occur more frequently around the equatorial ionization anomaly crest where the background charge density (total electron content crest-to-trough ratio) plays an important role. It is also observed that L-band scintillations around this sector decrease considerably from equinoctial months of 2015 to equinoctial months of 2016. The anomalous El Ni?o-Southern Oscillation and quasi-biennial oscillation recorded during the 2015–2016 winter might have contributed partly to the suppression of irregularities (and hence scintillations) in the succeeding equinox. Strong pre-midnight scintillations when triggered by equatorial spread F occur simultaneously at all stations. The zonal/vertical drift velocities of irregularities estimated from the time delay of occurrence of scintillations decrease from postsunset to midnight hours. On the other hand, simultaneous sporadic E and post-midnight scintillations occur over Dibrugarh and Cocos Islands in the absence of scintillations at the equator. Azimuthal position of post-midnight scintillations at these two locations suggests that they are the manifestation of a frontal structure of sporadic E.
机译：违规行为的性质和程度导致l波段夜间闪烁一次群五站Dibrugarh(27.5°N, 95°E,处(23.7°N, 92.8°E, 36°倾角),布莱尔港(11.6°N, 92.7°E, 9°倾角),和科科斯群岛(12.2°S, 96.8°E, 43°倾角)北部低情理之中南部沿95°E情理之中子午线是调查。卫星系统/全球定位系统/ ionosonde测量中分点月2015 - 2016利用。科科斯群岛最南端的站磁共轭。经常在赤道电离背景电荷密度异常峰值(总电子含量crest-to-trough比率)扮演重要的角色。l波段闪烁在这个部门减少从2015年二分数月的很多二分2016个月。倪?振荡记录在2015 - 2016年冬天可能会造成部分抑制的违规行为(因此闪烁)成功equinox。由赤道时闪烁传播F站同时发生。区域/垂直漂移速度违规行为的时间延迟估计出现闪烁的减少postsunset午夜小时。同时分散E和午夜之后闪烁发生在Dibrugarh和可可没有闪烁的岛屿赤道。闪烁显示在这两个位置他们的表现是额分散E的结构。

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