Solar control of ambient ionization of the ionosphere near the crest of the equatorial anomaly in the Indian zone
Long-term (1978–1990) total electron content (TEC) data have soderhamn ottoman cover been analyzed to show the dependence of ambient ionization on EUV radiation from the Sun.TEC observations were made at Calcutta (22.58° N, 88.38° E geographic, dip: 32° N), situated virtually below the northern crest of the equatorial ionization a