Physics
Scientific paper
Feb 1964
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964jatp...26..263b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 26, no. 2, pp. 263-264, IN15, 265-271
Physics
Scientific paper
The amplitude-frequency spectra and the distances of origin of radio-atmospherics have been obtained from an analysis of the observed waveform patterns. Amplitudes, relative to the amplitude at 10 kc/s, for different frequencies over a range from 3 to 15 kc/s are then plotted against the distances of origin. For frequencies below the reference frequency of 10 kc/s it has been found that the initial decrease of the relative field intensity is followed by a gradual increase after about 1200 km. On the other hand, for frequencies greater than the reference frequency, the relative field intensity has been found to increase rapidly after the initial decrease and subsequently to decrease gradually with distance. The marked difference in the nature of these curves for distances greater than 1200 km has been attributed to ionospheric reflections. It has been shown that if the received waveform pattern shows a succession of reflected impulses, then for a large distance and for large orders of reflection, higher frequencies are heavily attenuated. Due to this heavy attenuation of higher frequencies, a sinusoidal waveform of a very low frequency is expected at large distances and for large orders of reflection. The appearance of a low frequency component of 3.3 kc/s observed by Tantry and Srivastava (1958) may then be explained.
Bhattacharya H.
Rao Manoranjan
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