78-day periodicity in the solar 1-8 A X-ray index during the ascending branch of cycle 21

Details 78-day periodicity in the solar 1-8 A X-ray index during the ascending branch of cycle 21 78-day periodicity in the solar 1-8 A X-ray index during the ascending branch of cycle 21

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.162..123o&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 162, no. 1, Dec. 1989, p. 123-127.

Astronomy and Astrophysics

Astrophysics

2

Solar Activity, Solar Cycles, Solar X-Rays, Fourier Transformation, Power Spectra

Scientific paper

The time series of 1-8 A X-ray index for the time interval between January 1977 to September 1981 has been analyzed by calculating the power spectrum using the discrete Fourier transform. A 78-day periodicity, which is one-half of the period found from various solar parameters of cycles 20 and 21 by various authors, was found. This periodicity is thought to be related to the 152-day periodicity.

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