Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.215..131b&link_type=abstract
Astrophysics and Space Science, vol. 215, no. 1, p. 131-133
Astronomy and Astrophysics
Astrophysics
3
Fourier Analysis, Periodic Variations, Solar Activity, Sunspot Cycle, Saudi Arabia, Solar Observatories
Scientific paper
The eleven-year sunspot cycles are considered to represent one of the solar activities. The daily observations of the sunspots in the KAAU Solar Observatory (KAAUSO) have been utilized to reduce a period of the present solar cycle using Fourier techniques. The highest peak in the amplitude spectrum was for a frequency of 0.00029 per day, for which the maximum occurred in mid 1990.
Al-Mleaky Y. M.
Basurah Hassan M.
Malawi A. A.
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