2010/12/22 by A.-M. Broomhall, Anne-Marie Broomhall, Stephen T. Fletcher +13 · 1 citation
Chemistry · Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Chemistry #Dynamo #Dynamo theory #Helioseismology #Magnetic field #Oscillation (cell signaling) #Physics #SIGNAL (programming language) #Solar and Space Plasma Dynamics #Solar cycle #Solar cycle 22 #Solar dynamo #Solar wind #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · doi:10.1088/1742-6596/271/1/012025
6 pages, 2 figures, proceedings for SOHO-24/GONG 2010 conference, to be published in JPCS
arxiv created 2010/12/22 · openalex publication_date 2011/01/01 · arxiv updated 2015/05/20 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
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.