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ABSTRACT
Analysis of ionospheric data obtained during low sunspot activity period corresponding approximately to the first half of IQSY at Trivandrum is considered in this paper. The diurnal and seasonal variation of f0F2, hpF2 and fEs are described. The N-h profiles obtained have been utilized to study the diurnal and seasonal variations of electron density at different heights and the subpeak electron content of the ionosphere. The true heights of maximum electron-density are compared with those obtained by assuming a parabolic distribution.
The above results are compared with those obtained during high sunspot activity and the similarities and differences pointed out.