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Solar flares cause sudden disturbances at the Earth’s ionosphere. These effects are detected by the very low frequency (VLF), 3−30-kHz signals which are propagated at the Earth-ionosphere waveguide. The sudden changes on the time-dependent intensity of VLF signals are recorded by Super SID system during February, March, and April, 2013. Then VLF data were compared with the GOES satellite data found...
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