| || Measurement of radio noise level in Delhi area part II
Author : Chatterjee, R.N. ;Murty, Y.S.N.
Source : Defence Science Journal ; Vol:12(1) ; 1962 ; pp 48-54
Subject : 534.8 Acoustics
Keywords : Noise level ;Radio noise ;Ionosphere
Abstract : Measurement of Radio Noise Level on 150Kc/s were carried out by a direct method at Delhi. The nature of diurnal variation of Mean Peak Noise level on this frequency was studied. The results were compared with those obtained for the same frequency in the American Sub-Arctic region, during 1947. The similarity in the nature of diurnal variation for these two places was observed. For both the places the peak noise level was found to be minimum in the early hours of the morning till sunrise, gradually increasing afterwards. From this observation, it was suggested that the ionosphere contributes most to the Radio Noise level around 150Kc/s. The observed value of peak noise level at Delhi was found to vary between 10uV/Metre/Kc Bandwidth and 0.35uV/Metre/Kc Bandwidth.