Long-period fading in atmospherics during severe meteorological activity and associated solar geophysical phenomena at low latitudes

A. B. Bhattacharya (1) , S. K. Kar (1) , M. K. Chatterjee (1) , R. Bhattacharya (2)

1 Department of Physics
2 Centre of Advanced Study in Radio Physics & Electronics

The records of VLF atmospherics over Calcutta and then over Kalyani (West Bengal) during the torrential rainfall, caused by violent monsoon and post-monsoon depressions, exhibit distinct long-period fadings both at day and night. Interesting results obtained from an analysis of round-the-clock atmospherics data and associated meteorological parameters are reported in this paper. A possible correlation between the severe meteorological activity with the solar geophysical phenomena was studied. The results are indicative of an interesting sequence of solar-terrestrial events. A tentative conclusion is reached, suggesting an origin of the fading from atmospheric gravity waves generated in the centre of activity of the depressions concerned.

Domaines: Océan, Atmosphère; Sciences de la Terre

A. B. Bhattacharya, S. K. Kar, M. K. Chatterjee, R. Bhattacharya. Long-period fading in atmospherics during severe meteorological activity and associated solar geophysical phenomena at low latitudes. Annales Geophysicae, 1998, 16 (2), pp.183-188. ⟨hal-00316359⟩