Regular Behaviour of the Field Intensity of VLF Atmospherics over Calcutta

Abstract

Regular behaviour of the integrated field intensity of atmospherics (IFIA) over Calcutta have been analysed at 10, 20 and 30 kHz for a 2-yr period from October 1976 to September 1978 to explore its diurnal, day-to-day and seasonal variations in the VLF band. Some of the important results obtained are: (i) there is a month-to-month variation in the diurnal pattern showing highest value during the monsoon, (ii) a good correlation co-efficient (0·95) exists between the noise levels at extreme two frequencies, (iii) the median noise level at all the months decrease with the increase of frequency. All the results obtained have been interpreted in terms of source activity and propagation characteristics.

Indexing Terms:

• Field Intensity of Atmospherics
• Noise Levels
• Source Activity
• Propagation Characteristics

Additional information

Notes on contributors

A.B. Bhattacharya

Bhattacharya, A B: Born on 1st July, 1951. Obtained first class MSc degree in Physics from the University of Calcutta in 1973. Submitted his thesis on Atmospherics related to Meteorology for PhD degree in the same University in 1979. At present working in the Department of Physics, Serampore College, Serampore, as a lecturer. His fields of interest are mainly in Atmospheric Physics, Meteorology and Radio wave Propagation. Shri Bhattacharya has designed and constructed TRF receivers and allied instruments for recording atmospherics in the VLF band over Calcutta. He has already published 16 papers in this field in Indian and Foreign journals.

S.K. Sarkar

Sarkar, S K (Dr): Born on March 1, 1940, in West Bengal, India. School, College and University education were all in Calcutta. Stood first class first in MTech examination, 1962, in Radio Physics and Electronics, C.U. Appointed lecturer in Physics, C.U., in 1964. Now working as a Reader. Has been the in charge of the electronics section of the Department. Has published 40 papers in different scientific journals at home and abroad. Investigator-in-charge of UGC and CSIR research projects. Guiding research scholars mainly in the field of ‘Solar radio astronomy’ and ‘Atmospherics in relation to cloud physics’.