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The method for the daily monitoring of the differential reflectivity bias forpolarimetric weather radars is developed further. Improved quality control isapplied to the solar signals detected during the operational scanning of theradar, which efficiently removes rain and clutter-contaminated gates occurringin the solar hits. The simultaneous reflectivity data are used as a proxy todetermine which data points are to be removed. A number of analysis methodsto determine the differential reflectivity bias are compared, and methodsbased on surface fitting are found superior to simple averaging. A separatefit to the reflectivity of the horizontal and vertical polarization channelsis recommended because of stability. Separate fitting also provides, inaddition to the differential reflectivity bias, the pointing difference ofthe polarization channels. Data from the Finnish weather radar network showthat the pointing difference is less than 0.02° and that thedifferential reflectivity bias is stable and determined to better than0.04 dB. The results are compared to those from measurements at verticalincidence, which allows us to determine the total differential reflectivity biasincluding the differential receiver bias and the transmitter bias

Improved analysis of solar signals for differential reflectivity monitoring