Abstract
The first pre-sunrise fall in amplitude of radio waves of frequency 164 kHz transmitted from Radio Tashkent and received at Delhi at a distance of about 1600 km is found to occur in a majority of cases when the solar zenith angle, χ at the path mid-point is near 98°. It is shown that this value of χ has a small seasonal variation which is directly correlated with total ozone content. This result suggests that ultraviolet light is the agency responsible for the release of electrons during the pre-sunrise period. The fall in amplitude from its commencement up to the first minimum is not always smooth but is accompanied in about 40 per cent of the cases by a sudden change in the gradient occurring mostly near χ = 95°. This may indicate the existence of more than one species of negative ions.
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