Abstract
The rainrate distributions obtained from rapid response rain gauge measurements over five different locations in India are presented. On the basis of simultaneous observations of rainrate measured by rain gauges having integration times of 10 seconds and 15 minutes, a power law has been established. Rain attenuation characteristics at 11GHz were analysed and some interesting results are presented, which are also compared with International Radio Consultative Committee and other models. Attenuations due to water vapour are deduced for a frequency range of 1-350GHz at elevation angles 3 and 10 . The attenuation due to water vapour at a lower elevation angle is found to increase as the tropospheric effects become dominant. It can also be seen that the antenna temperature attains a peak value of about 160K in the monsoon months and a minimum of about 80 K during the winter. The monthly variation of antenna temperature reveals a similar variation for the attenuation and water vapour content.
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