160 minute solar variations and the 22 year cycle

✍ Scribed by V. A. Kotov; T. T. Tsap

• Publisher: Springer
• Year: 1990
• Tongue: English
• Weight: 606 KB
• Volume: 128
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00154163

✦ Synopsis

Systematic measurements of the differential Doppler velocity of the Sun have been performed in Crimea from 1974 through 1988 (total 987 days, 6197 hours of observations). They confirm the presence of a long-term phase-coherent solar pulsation with a period of 160.010 min. On the other hand, the analysis of new data suggests that solar 160 min pulsation might, in frequency, have a multiplet fine structure. In particular, large changes of amplitude and phase of the pulsation over the years 1982-1986 may indicate that during the last few years we have been observing the solar 160 min oscillation of the 'second portion' of the 22 year solar cycle.

It is further noted that the beat period of the two closely spaced frequencies (periods are 160.0101 and 160.0126 min) equals 19.5 + 1.1 year, which is in good agreement with the average length of the solar magnetic activity cycle, 20-22 years. Being verified, this unpredicted property of the pulsation can offer a novel possibility for probing the Sun's interior and perhaps for the study of the internal rotation and 11( 22) year cycle of a star.