Diurnal Variation of Hourly Median Field Strength of 1940 MC./SEC. Signal in the Foothills of Central Himalayas

Abstract

AbstractMicrowave signals in the 2000 mc./sec. region were recorded between Roorkee (264 metres above sea-level) and Landour (2296 metres above sea-level) in the foothills of Central Himalayas. The terminals are 69 kilometres apart, with intervening ridges 834 and 670 metres high situated at 32 and 40 kilometres respectively from Landour. Typical chart records of the microwave signal and the diurnal variation of hourly median field strength derived from these are presented for one year (1957–58).The maximum signal occurs at night, usually after midnight, while the minimum signal normally occurs shortly after midday. Pronounced diurnal variation of signal appears in summer, i.e. April, May and June. During the monsoon, i.e. July to September, although the general pattern is the same, it is complicated by comparatively large irregular fluctuations. At other times the variation is complex and not as clearly defined as during the summer. Ground level meteorological data recorded at Roorkee and Landour appear ...