Abstract
SINCE the middle of the last decade, the study of the conducting upper atmosphere—the ionosphere—has been proceeding vigorously in various parts of the world. The countries where the study originated—England and the United States—are situated at high latitudes, far from the equator. In view of the fact that ionospheric conditions in a subtropical region of low latitude, like that of India, were likely to differ considerably from those in a region of high latitude—particularly with regard to the effect of meteorological disturbances of terrestrial or solar origin, such as thunderstorms, magnetic storms, etc.—the study of the ionosphere was taken up at Calcutta1 (22° 34′ N., 88° 22′ E.) in 193D and has been continued uninterruptedly since then. Recently, measurements have been made at Allahabad2 (25° 26′ N., 81° 50′ E.) and Bangalore3 (12° 58′ N., 77° 35′ E.) on ionospheric heights—at the former on ionisation density as well—and at Dacca4 (23° 43′ N., 90° 24′ E.), on fading.
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Mitra, S. Ionospheric Studies in India. Nature 137, 503–504 (1936). https://doi.org/10.1038/137503a0
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DOI: https://doi.org/10.1038/137503a0