The dynamic spectral record of long wave radio signals (kHz band) had registered a disturbed condition of the ionosphere region involved with propagation of these signals. The reason for such signatures in the dynamic spectrogram can be accredited to the impact of Solar Energetic Particles (SEP) on the ionosphere along the propagation path of terrestrial long wave radiation, studied using the Multi-Hop propagation model. Points of reflection in the ionosphere directly above specific locations above the earth where determined. Total Electron Content (TEC) values for such regions were obtained from interputing the Global Positioning System (GPS) data. From a comparison of such results during periods when the Sun was quiet and active periods, the magnitude of ionosphere disturbance contributed by the various active solar phenomena's has been determined. The paper is based on the impact of Geomagnetic storm (Kp=6) on the TEC, that occurred on 16 April 2015. Long wave radio signals from transmitters located in places like United States Navy near Lualualei, Hawaii (Geomagnetic lat 21°25′13.38″, Geomagnetic long 158°09′14.35'W) and Rosnay near France (Geomagnetic lat 46°42′47″N, Geomagnetic long 1°14′39″E) were monitored closely to know extent of the impact.
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S. Manoj and Dr. Shanmugha Sundaram G. A., “Dynamic spectrum of long wave terrestrial radio signals during episodes of ionospheric disturbances caused by solar activity”, Journal of Chemical and Pharmaceutical Sciences, vol. 9, pp. 548-553, 2016.