Water vapour attenuation studies from 1 to 350 GHz over the Indian subcontinent

Water vapor plays a dominant role in terrestrial and earth-space communication systems. Based on radiosonde observations, water vapor concentrations are estimated over the Indian subcontinent and found to exhibit strong geographical and seasonal variations. Attenuations due to water vapor are deduced from 1 to 350 GHz at various elevation angles. The attenuation in window regions is found to be significant particularly along the Indian southwest coast.