Abstract
The results of statistical analysis of a new phenomenon, the Sudden Change in the Integrated Intensity of Atmospherics (SCIIA) to a high or low value occurring within a few seconds followed by a slow exponential recovery to the normal existing value within a relatively long time reckoned in minutes are reported. A number of physical parameters were defined to quantitatively describe the phenomenon and the results of measurements on the records of three selected VLF bands were statistically analysed to bring out the characteristics of the phenomenon. The results are discussed and a plausible explanation of the phenomenon of SCIIA based upon the sudden increase in ionisation at the “control points” in the lower ionosphere due to the incidence of a sufficiently large single meteor or a shower of small meteors penetrating to different depths in the ionosphere is put forward.
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