Long-period signals in the 8 MM solar radio emission

Details Long-period signals in the 8 MM solar radio emission Long-period signals in the 8 MM solar radio emission

Feb 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...191..359k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 191, no. 2, Feb. 1988, p. 359-364.

Astronomy and Astrophysics

Astrophysics

8

Solar Oscillations, Solar Radio Emission, Millimeter Waves, Solar Granulation, Time Series Analysis

Scientific paper

Using the Helsinki University of Technology 14-m radio telescope at 8-mm wavelength, 10-h time series of quiet sun radio-flux from five different areas are analyzed to search for long-period signals. The application of sensitive and improved methods of time-series analysis offers a new insight into the information content of the relatively short records. Significant components with periods near 260, 160, and 90 min exist. The amplitude of the 160-min period varies significantly and is only confirmed at two positions. The results can partially be explained in terms of g modes. A possible interpretation of the 260-min and 90-min periods, invoking the effect of supergranulation pattern rotation through the beam, is discussed.

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