Are short-term variations in solar oscillation frequencies the signature of a second solar dynamo?

Details Are short-term variations in solar oscillation frequencies the signature of a second solar dynamo? Are short-term variations in solar oscillation frequencies the signature of a second solar dynamo?

2010-12-22

arxiv.org/abs/1012.4933v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 2 figures, proceedings for SOHO-24/GONG 2010 conference, to be published in JPCS

Scientific paper

In addition to the well-known 11-year solar cycle, the Sun's magnetic activity also shows significant variation on shorter time scales, e.g. between one and two years. We observe a quasi-biennial (2-year) signal in the solar p-mode oscillation frequencies, which are sensitive probes of the solar interior. The signal is visible in Sun-as-a-star data observed by different instruments and here we describe the results obtained using BiSON, GOLF, and VIRGO data. Our results imply that the 2-year signal is susceptible to the influence of the main 11-year solar cycle. However, the source of the signal appears to be separate from that of the 11-year cycle. We speculate as to whether it might be the signature of a second dynamo, located in the region of near-surface rotational shear.

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