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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 26, issue 1
Ann. Geophys., 26, 47–57, 2008
https://doi.org/10.5194/angeo-26-47-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 26, 47–57, 2008
https://doi.org/10.5194/angeo-26-47-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  04 Feb 2008

04 Feb 2008

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

S. K. Chakraborty and R. Hajra S. K. Chakraborty and R. Hajra
  • Department of Physics, Raja Peary Mohan College, Uttarpara, Hooghly, Pin.712258, India

Abstract. Long-term (1978–1990) total electron content (TEC) data have 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 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 the F10.7 solar flux and the monthly mean TEC when both are considered on a long-term basis, i.e. either in the ascending (1986–1990) or in the descending (1979–1985) phase. In the early morning hours the correlation coefficient maximizes around the 08:00–10:00 h IST interval. The flux independent nature of diurnal TEC is evident around the noon time hours of only a few months in the descending phase for F10.7 values greater than 150 unit. Variation of TEC for the whole time period (1979–1990) also exhibits a prominent hysteresis effect. The remarkable feature of the hysteresis effect is its local time dependence, leading to a temporal flip-over. Solar flux-normalized TEC values show a clear seasonal dependence with asymmetrical variations in the two equinoxes. The amplitudes of the equinoctial peaks reveal a prominent local time dependence. A further normalization leads to a typical local time variation of TEC. 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 the solar flux dependent nature of the TEC variation. The formula has been validated using the available TEC data and data from the neural network.

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