Anomaly of natural ULF-VLF radiation during solar eclipses

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A comparative analysis of the spectrochronograms of natural electromagnetic signals in ULF-VLF range
during solar eclipses with spectrochronograms during their absence was carried out. It was shown that anomalies
in ULF-VLF radiation during eclipses are determined by the changes in the conditions of signal propagation
from global thunderstorm activity centers in the result of changing of Fresnel zone size caused by moon shadow.
The results of VLF measurements at two points allow us to estimate the location of the radiation effective
sources.