A comparison of electron density profiles over Ahmedabad in years of low and high solar activity

Abstract

The median vertical distributions of electron density over Ahmedabad (23°01 N, 72°36 E) in January, April, July and October in the years of low and high solar activity 1954 and 1957–1958 have been calculated from ionograms. A method suggested by King (1960) has been used for the calculation. The P′ f records on all the days of the month for the same local hour were superposed and the monthly median p′ f curve interpolated. This was then subjected to true height analysis by applying the standard Schmerling method used for the analysis of individual curves. The diurnal electron densities are presented in the form of iso-electron-density contours against height. The curves are extrapolated above the level of maximum electron density assuming Garriott's model for the distribution. The major features of diurnal and seasonal variation are discussed.