Low-Frequency Time-Code Signal Field Strength Variation Analysis After the analysis of the solar activity, ionospheric and magnetic field data, we can preliminarily determine the reasons for the variation in the field strength of the low-frequency time-code signal during the annular eclipse: (1) As the extent of moon shielding gradually increased and then gradually disappeared on the day of the annular eclipse, the total electron content of the ionosphere yielded a decreasing trend first followed by an increasing trend [ 36 , 37 ].
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Variation of Low-Frequency Time-Code Signal Field Strength during the Annular Solar Eclipse on 21 June 2020: Observation and Analysis.
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