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Six C-band weather radars located in Europe (Finland, Netherlands, and Switzerland) have been used to monitor the slowly varying solar emission, which is an oscillation with an amplitude of several decibels and a period of approximately 27 days. It is caused by the fact that the number of active regions that enhance the solar radio emission with respect to the quiet component, as seen from Earth, varies because of the Sun's rotation about its axis. The analysis is based on solar signalsdoi:10.1155/2017/4971765 fatcat:yz6cjdgp65erraqopvu5xorvwy