Physics
Scientific paper
Apr 1962
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1962jatp...24..245r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 24, no. 4, pp. 245-256
Physics
Scientific paper
An analysis has been presented in this paper of the measurements of ionospheric absorption taken at Delhi (28°35'N, 77°5'E) for the period 1954-1960. The measurements were carried out by means of an automatic absorption recorder where the ionospheric absorption was directly recorded on a pen and ink recorder. The analysis of the observed data indicates that the frequency variation of absorption obeys approximately an inverse square lawE The diurnal variation factor for D-layer absorption is 0·77. Seasonal variation of absorption indicates higher absorption in winter than what one would normally expect from the diurnal variation factor. The relaxation time is approximately 40 min. A well-defined and consistent pre-noon maximum has also been observed about 40 min before noon. Residual absorption at night is quite low and is of the order of 2-3 dB. There is no significant relationship between magnetic activity and ionospheric absorption at Delhi. The decrease in absorption after the occurrence of a radio fade-out follows closely the change in the signal from the D-region of a distant longwave transmitter (164 kc/s) indicating that most of the absorption at our latitude is from the D-layer.
Mazumdar S. C.
Mitra S. N.
Rao K. M.
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