Tropospheric transhorizon propagation characteristics at 2 GHz in Northern India

Based on radiometeorological observations at 2 GHz and 120 MHz over two co-located transhorizon tropospheric propagation paths in Northern India during 1971, this paper describes the propagation characteristics and analyses the mechanisms of propagation at 2 GHz. Correlation of hourly median signal with refractivity gradient was found to be good while correlation with surface refractivity was much poorer. Evidence is presented to show that scattering was responsible for weaker values of observed signal, reflexion for intermediate signal levels which include the long-term median, while the guided mode was responsible for the higher levels of observed signal.