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Nighttime fading ofVLF andLF atmospherics in relation to geomagnetic activity

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Summary

Long-period fading observed in recordings ofVLF andLF atmospherics in meteorologically clear nights exhibits a good correlation with the geomagnetic activity indexA p . The fading phenomenon occurs more frequently in the case of integrated field intensity of atmospherics than in the case of andLF radio signal transmitted from a certain station. The phenomenon has been analyzed for the monsoon and postmonsoon periods separately, and the results have been discussed in relation to the large-scale travelling ionospheric distubances (LS TID). The modal value of fade periods forVLF andLF atmospherics has been found to be about one hour. It is noted that the correlation of the fade amplitude of highttimeVLF andLF atmospherics versus the geomagnetic activity is frequency dependent and increases fromVLF toLF.

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Author notes

  1. B. K. De

    Present address: Department of Physics, Tripura University, 799 004, Agartala, Tripura, India

  2. S. K. Sarkar

    Present address: Department of Physics, University College of Sciences, University of Calcutta, 92 A.P.C. Road, 700 009, Calcutta, India

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    1. B. K. De
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    2. S. K. Sarkar
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    De, B.K., Sarkar, S.K. Nighttime fading ofVLF andLF atmospherics in relation to geomagnetic activity. Meteorl. Atmos. Phys. 55, 235–242 (1995). https://doi.org/10.1007/BF01029830

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