Solar control of ambient ionization of the ionosphere near the crest of the equatorial anomaly in the Indian zone

Details Solar control of ambient ionization of the ionosphere near the crest of the equatorial anomaly in the Indian zone Solar control of ambient ionization of the ionosphere near the crest of the equatorial anomaly in the Indian zone

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007basi...35..599c&link_type=abstract

Bulletin of the Astronomical Society of India, Vol. 35, p. 599-605

Astronomy and Astrophysics

Astronomy

Solar-Terrestrial Relations, Sun: Uv Radiation, Solar Activity

Scientific paper

Long term (1979-90) total electron content (TEC) data have been analyzed to show its dependence on EUV radiation from the sun. TEC observation has been made from Calcutta (22.58° N, 88.38° E geographic, dip: 32° N), situated virtually below the northern crest of equatorial ionization anomaly. Day to day changes in TEC at different local times do not show any significant correlation with F10.7 solar flux. A good correlation is, however, observed between F10.7 solar flux and monthly mean TEC when both are considered on long term basis, i.e., either in the ascending (1986-90) or in the descending (1979-85) phases. In the early morning hours correlation coefficient maximizes around 0800-1000 IST interval. The flux independent nature of diurnal TEC is prominent around the noon time hours of few months with F10.7 values greater than 150. Variation of TEC for the whole time period (1979-90) also exhibits a prominent hysteresis effect. A remarkable feature of hysteresis effect is its local time dependent nature. Solar flux normalized TEC exhibit clear seasonal dependence with asymmetrical variations in the two equinoxes. A further normalization leads to prominent local time dependent feature. Based on solar flux, seasonal and local time dependent features of TEC an empirical formula has been developed to represent the TEC variation in the early morning hours. It yields a quantitative estimate of solar flux dependent nature of TEC variation.

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