Relationship of the onset of equatorial F region irregularities with the sunset terminator observed with the Equatorial Atmosphere Radar
Relationship of the onset of equatorial F region irregularities with the sunset terminator observed with the Equatorial Atmosphere Radar
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DOI：
10.1029/2004gl021529
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发表时间：
2004-12
影响因子：
5.2
通讯作者：
T. Yokoyama;S. Fukao;M. Yamamoto
中科院分区：
文献类型：
--
作者：
T. Yokoyama;S. Fukao;M. Yamamoto
本文讨论了2002年10月至2004年4月47 MHz赤道大气雷达观测到的与赤道扩散F （ESF）有关的雷达后向散射羽流开始与日落终止点之间的关系。在与观测区相连的地磁力线顶点高度，几乎所有不规则回波都在日落后或日落后开始出现，半数以上的不规则回波的发生时间与日落后顶点时间完全一致。这种趋势可能是由于两个原因造成的：(1)夜间纬向电场的快速变化和(2)在日落顶点前太阳辐射对3 m尺度不规则性的阻尼。
The relationship between sunset terminators and the onset of radar backscatter plumes associated with equatorial spread F (ESF) observed with the 47‐MHz Equatorial Atmosphere Radar from October 2002 to April 2004 is discussed. Almost all irregularity echoes began to appear at or before sunset time at the altitude of the apex of the geomagnetic field line connected with the observed area, and the onset time of more than half of the events corresponded exactly to apex sunset time. This tendency should be due to two causes: (1) the rapid change of the evening zonal electric field and (2) damping of 3‐m scale irregularities by the solar radiation before the apex sunset.