Sastri, J. H; Sasidharan, K; Subramanyam, V; Srirama Rao, M
(European Geophysical Society, 1979-09)
Using ionogram data at Kodaikanal (geomagnetic lat. 06 deg N, Dip 3.5 deg N) over a seven year period, Jan. 1957-Dec. 1963, a study is made of the seasonal and sunspot cycle variations in the nocturnal occurrence of amplitude ...