Altitude‐extended equatorial spread F observed near sunrise terminator over Indonesia
Altitude‐extended equatorial spread F observed near sunrise terminator over Indonesia
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DOI：
10.1029/2003gl018383
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发表时间：
2003-11
影响因子：
5.2
通讯作者：
S. Fukao;Y. Ozawa;M. Yamamoto;R. Tsunoda
中科院分区：
文献类型：
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作者：
S. Fukao;Y. Ozawa;M. Yamamoto;R. Tsunoda
利用47 MHz赤道大气雷达(EAR)首次在印度尼西亚西苏门答腊岛(0.2°S，100.32°E；倾角纬度10.36°N)观测到了与等离子体泡有关的日出后后向散射羽流的空间结构。这股烟羽很可能与地磁风暴有关。它从似乎是F层底部的地方延伸到电离层上方，与之前观测到的所有羽流不同。它还在经度(即东西方向)上延伸，似乎涉及两个空间上分离的区域。在接近200-250公里高度的日出时分首次观测到烟羽，但当时E区还没有阳光照射。视线多普勒速度的空间分布图显示，后向散射区有向上发展和向西漂移，这表明白天的漂移条件。观测结果仍然令人费解，因为羽状物在E区日出后持续了大约两个小时。
Spatial structure of a post‐sunrise backscatter plume associated with a plasma bubble has been observed for the first time with the 47–MHz Equatorial Atmosphere Radar (EAR) in West Sumatra, Indonesia (0.20°S, 100.32°E; dip latitude 10.36°N). This plume is likely associated with a geomagnetic storm. It extended from what appears to be the base of the F layer into the topside ionosphere and differed from all plumes previously observed. It was also extended in longitude (i.e., in the east‐west direction), and appeared to involve two spatially separated regions. The plume was first observed around sunrise, close to 200–250 km altitude, but at a time when the E region was not yet sunlit. Spatial maps of the line‐of‐sight Doppler velocity show that there was upward development and westward drift of backscatter regions, indicative of daytime drift conditions. The observations remain puzzling because the plume continued for approximately two hours after E region sunrise.