Semidiurnal temperature oscillation and E-region absorption over Haringhata

An attempt has been made to explain the observed asymmetry in the diurnal curves on absorption for the E region at 2.2 MHz for the field station at Haringhata (22 deg 56'N, 88 deg 36'E). A comparison between the computed and observed diurnal curves on absorption revealed that a part of the asymmetry was a manifestation of the effect of semidiurnal temperature oscillation present in the E layer. It was further noted that the degree of the asymmetry of the observed diurnal curves depends profoundly on the rate of downwards phase progression of the temperature oscillation.