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Sisir Kumar Mitra

Sisir Kumar Mitra, Indian radio astronomer (Calcutta 24 October 1890 – Calcutta 13 August 1963)

First to obtain experimental evidence for E layer of the ionosphere (1930)

Located C and D layers of ionosphere with P. Shyam (1935)

Determined that ions in the F ionosphere’s layer caused luminescence of the night sky

Explained Appleton ionization anomaly   

Published Upper Atmosphere, basic reference for researches in this area (1947)
Mitra crater in Moon