The Lower Ionospheric VLF/LF Response to the 2017 Great American Solar Eclipse Observed Across the Continent

The Lower Ionospheric VLF/LF Response to the 2017 Great American Solar Eclipse Observed Across the Continent
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整个大陆观测到的低电离层 VLF/LF 对 2017 年美国大日食的响应

DOI:
10.1002/2018gl077351
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发表时间:
2018
影响因子:
5.2
通讯作者:
Rockway, J.
Rockway, J.
中科院分区:
地球科学1区
文献类型:
--
作者:
Cohen, M. B.;Gross, N. C.;Higginson-Rollins, M. A.;Marshall, R. A.;Gołkowski, M.;Liles, W.;Rodriguez, D.;Rockway, J.

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我们介绍了2017年8月21日“大美国日食”期间美国大陆11个甚低频(VLF)/低频(LF)接收器的观测结果。所有接收器都检测到来自低于50 kHz的VLF/LF信标的传输,而七个接收器还记录了高于50 kHz的LF信标,产生了数十个单独的发射器-接收器无线电链路。我们的观察显示了两个可分离的叠加特征:(1)随着日食的推进,几乎所有路径上的信号水平逐渐上升和下降,然后下降,因为VLF衰减被日食下电离层的变化所减少,以及(2)直接反射散射100公里宽的狭窄的全食点,当发射器或接收器,如果不是两者,离全食点相对较近。
We present observations from 11 very low frequency (VLF)/low‐frequency (LF) receivers across the continental United States during the 21 August 2017 “Great American Solar Eclipse.” All receivers detected transmissions from VLF/LF beacons below 50 kHz, while seven also recorded LF beacons above 50 kHz, yielding dozens of individual transmitter‐receiver radio links. Our observations show two separable superimposed signatures: (1) a gradual rise and fall in signal levels visible on almost all paths as the eclipse advances and then declines, as VLF attenuation is reduced by the changing ionosphere under an eclipsed Sun, and (2) direct reflective scattering off the narrow 100‐km‐wide totality spot, observed more uniquely when the transmitter or receiver, if not both, are relatively close to the totality spot.
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发表时间: 2002
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