Abstract
SINCE early 1960 we have been recording at Ahmedabad the field strengths of radio waves of 164 kHz transmitted from Tashkent. A pronounced minimum recurred night after night in the months April to July, the local time of the minimum shifting to earlier hours as the days advanced from April to July.
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ANANTHAKRISHNAN, S., RAMANATHAN, K. Effect on the Lower Ionosphere of X-rays from Scorpius XR-1. Nature 223, 488–489 (1969). https://doi.org/10.1038/223488a0
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DOI: https://doi.org/10.1038/223488a0
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