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Title: Ionospheric Propagation of Medium Frequencies
Authors: Rao, C. S. R.
Sundaram, T. R.
Roy, J. M.
Issue Date: Jun-1974
Publisher: NISCAIR-CSIR, India
Abstract:   The results of a study of the night-time propagation of medium frequencies through the ionosphere are presented. The study concerns the build-up of sky-wave signal through the sunset period, the night-time unabsorbed signal and the decay through the sunrise. The results are based on observations for a period of two years on each of the two frequencies 670 kHz and 1320 kHz for a 1310km path between Delhi (77° 13' E; 28°39' N) and Calcutta (88° 23' E; 22° 35' N.
  Total absorption is estimated from the signal strength variations around the sunset period and the data are utilized to calculate recombination coefficients of the absorbing layer at different hours after sunset. These values are in general agreement with the ones obtained by other workers. Analysis of the data indicates that the period during which steady sky-wave signals can be received is from about 3 hr after sunset to about 2 hr before sunrise and this fact bas to be taken into consideration for frequency planning in the medium frequency band.
Page(s): 142-145
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.03(2) [June 1974]

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