Nighttime‐like quasi periodic echoes induced by a partial solar eclipse
Nighttime‐like quasi periodic echoes induced by a partial solar eclipse
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DOI：
10.1029/2010gl042855
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发表时间：
2010-05
影响因子：
5.2
通讯作者：
S. Thampi;M. Yamamoto;Huixin Liu;S. Saito;Y. Otsuka;A. Patra
中科院分区：
文献类型：
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作者：
S. Thampi;M. Yamamoto;Huixin Liu;S. Saito;Y. Otsuka;A. Patra
本文介绍了在新垣（34.85°N,136.1°E， 25.0°N地磁）利用中高层大气雷达（MU雷达）首次观测到日蚀引起的中纬度等离子体不规则现象。这些观测是在2009年7月22日日偏食期间进行的。观测结果表明，太阳辐射的突然撤出可能会耗尽背景E -区域的密度，从而揭示出在强而零星的E -层中的长寿命金属离子。结果产生了准周期（QP）回波，这些回波被MU雷达探测到。这些回波类似于多通道干涉成像显示的中纬度地区观测到的正常日落后QP回波。这个例子表明，在日偏食期间，中纬度E区等离子体的不规则性可以产生，揭示了迄今为止尚未观测到的中纬度电离层对日食的响应。
The first observations of solar eclipse induced mid‐latitude plasma irregularities using the middle and upper atmosphere radar (MU radar) at Shigaraki (34.85°N,136.1°E, 25.0°N geomagnetic) are presented. The observations were done during the partial solar eclipse on 22 July, 2009. The observations show that the sudden withdrawal of solar radiation could deplete the background E‐region densities, thereby unmasking the long‐lived metallic ions within the strong and patchy Sporadic E‐layers. As a result of this, Quasi‐Periodic (QP) echoes were generated, which were detected by the MU radar. These echoes resemble the normal post‐sunset QP echoes observed over mid‐latitudes as revealed by the multi‐channel interfereometry imaging. This example shows that over mid‐latitudes E‐region plasma irregularities can be generated during a partial solar eclipse, revealing a hitherto unobserved aspect of mid‐latitude ionospheric responses to eclipses.