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首页> 外文期刊>Advances in space research >Response of the mid-latitude D-region ionosphere to the total solar eclipse of 22 July 2009 studied using VLF signals in South Korean peninsula
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Response of the mid-latitude D-region ionosphere to the total solar eclipse of 22 July 2009 studied using VLF signals in South Korean peninsula

机译：使用南朝鲜半岛的甚低频信号研究了中纬度D区电离层对2009年7月22日日全食的响应

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摘要

In this paper, we analyze VLF signals received at Busan to study the the D-region changes linked with the solar eclipse event of 22 July 2009 for very short (～390 km) transmitter-receiver great circle path (TRGCP) during local noon time 00:36-03:13 UT (09:36-12:13 KST). The eclipse crossed south of Busan with a maximum obscuration of ～84%. Observations clearly show a reduction of ～6.2 dB in the VLF signal strength at the time of maximum solar obscuration (84% at 01:53 UT) as compared to those observed on the control days. Estimated values of change in Wait ionospheric parameters: reflection height (h') in km and inverse scale height parameter (β) in km~(-1) from Long Wave Propagation Capability (LWPC) model during the maximum eclipse phase as compared to unperturbed ionosphere are 7 km and 0.055 km~(-1), respectively. Moreover, the D-region electron density estimated from model computation shows 95% depletion in electron density at the height of ～71 km. The reflection height is found to increase by ～7 km in the D-region during the eclipse as compared to those on the control days, implying a depletion in the Lyman-α flux by a factor of ～7. The present observations are discussed in the light of current understanding on the solar eclipse induced D-region dynamics.
机译：在本文中，我们分析了釜山接收到的甚低频信号，以研究与2009年7月22日日食事件有关的D区变化，该变化与当地正午时间非常短（约390 km）的收发器大圆路径（TRGCP）有关00：36-03：13 UT（09：36-12：13 KST）。日食横越釜山以南，最大遮盖度约为84％。观测结果清楚地表明，与对照天相比，在最大的太阳遮挡时，VLF信号强度降低了约6.2 dB（在UT 01:53时为84％）。估计的电离层参数变化的估计值：在最大食相期间与未扰动相比，长波传播能力（LWPC）模型中的反射高度（h'）以km为单位，反比例高度参数（β）以km〜（-1）为单位电离层分别为7 km和0.055 km〜（-1）。此外，由模型计算得出的D区电子密度显示，在〜71 km高度处电子密度消耗了95％。与对照日相比，日食期间D区的反射高度增加了约7 km，这意味着Lyman-α通量损耗了约7倍。根据对日食引起的D区域动力学的当前理解，讨论了当前的观测结果。

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