Abstract
The phase integral solution of the wave equation is a fairly good approximation in computing the radio wave absorption and virtual height for a slowly varying ionosphere. In the present paper we have used different ionospheric electron density models for E- and F-region heights and constant electron collision frequency for calculating the phase integral corrections to absorption and virtual height. It is found that the maximum corrections to absorption and virtual height for O-mode are of the order of 6 per cent and 3 per cent respectively, whereas for the X-mode they are comparatively smaller. It is also found that with increasing geomagnetic dip angle the corrections for the O-mode increase while those for the X-mode decrease. The results for the O-mode are in good agreement with the approximate expressions for absorption and virtual height given by earlier workers. However, no such explicit relations are available for the X-mode.
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