Conversion of rainrate statistics with various integration times to equivalent one-minute distributions

Recent ITU-R recommendations indicate that rainrate distributions with integration time of one minute should be used for obtaining statistics to be applied in rain attenuation prediction methods. However, long-term rainrate statistics available for Brazil have integration times ranging from five minutes to one hour, making necessary to reliably convert these to equivalent one-minute distributions. Various procedures have previously been tested with rainfall data from Brazilian tropical and equatorial regions, with reasonable accuracy. A recently developed method is applied here to convert statistics with higher integration times, obtained from data measured at six locations of three different climatic regions in Brazil, to equivalent one-minute rainrate distributions. Comparison of these distributions with those obtained from measurements show excellent agreement.