On the 22-year oscillations

✍ Scribed by Oleg B. Vasilyev; Valentine I. Makarov

• Publisher: Springer
• Year: 1996
• Tongue: English
• Weight: 542 KB
• Volume: 163
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00147999

✦ Synopsis

Observational data of the solar diameter in Italy during 1876 -1937 and in Greenwich during 1851 -1937 were analyzed. The Whittaker operator with different smoothing coefficients was used. The average data sets for the analysis of the possible oscillations of the solar diameter during 1876-1937 were obtained. Average values of the solar radius R(t) and absolute values of its time derivative IdR(t)/dt I were compared with the Wolf number, W(t), and with the integral A(t) = f: W(t)dt + constant. A good correlation r(R', W) = <[dR(t)/dt h W(t)) and r(R, A) = (/~(t), A(t)> was found. It was shown that the frequency spectra of R(t) and A(t) are similar. It was found that during odd 11-yr cycles, the solar diameter decreases, whereas during even cycles it increases. A hysteresis-like behavior in the variation of R(t) during the 22-yr solar magnetic cycle was demonstrated.