Periodicity in the basal component of solar radio emission

Astronomy and Astrophysics – Astronomy

Scientific paper

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Sun: Radio Radiation

Scientific paper

The periodicity in the basal component of solar radio emission in the 0.245-15.4 GHz frequency band has been detected after evaluation of the Fourier integral over the time domain. Two types of periodicity have been observed in the cyclic variation of the basal component of the radio emission. The lower period of about 47d remains constant above 2GHz. It declines with a dip at about 0.6 GHz, after which it again rises with decreasing frequency. The upper period has a value of 45d at about 0.6 GHz, after which it increases gradually with increasing frequency and attains a value of the order of 113d at about 15.4 GHz. The spectrum of the basal component of solar radio emission has also been determined in order to assess the mechanism pertaining to this type of radio emission.

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