Implications of the Deep Cycle 23/24 Minimum for our Understanding of the Solar Dynamo

Details Implications of the Deep Cycle 23/24 Minimum for our Understanding of the Solar Dynamo Implications of the Deep Cycle 23/24 Minimum for our Understanding of the Solar Dynamo

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh24b..03f&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH24B-03

Astronomy and Astrophysics

Astrophysics

[7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle, [7544] Solar Physics, Astrophysics, And Astronomy / Stellar Interiors And Dynamo Theory

Scientific paper

When the cycle 23/24 minimum is considered in the light of the existing record of 1,500 years of solar output proxies, it can be understood as a typical minimum of a periodic modulation of the amplitude of the 11-year solar cycle, which we call the Centennial Gleissberg Cycle (CGC). This 90-100 year amplitude variation has been well established by earlier studies (Gleissberg, 1965, Siscoe, 1980, Silverman and Feynman, 1980, Sonnett, 1982) and is present at least 80% of the time since 450 AD. It consists of a series of about nine or ten 11-year cycles with amplitudes that gradually rise and then fall (Feynman and Fougere, 1988). Previous well-established deep minima took place about 1710, 1810 (Dalton Minimum) and 1910. Because of this record a minimum about 2010 was not unexpected (e.g. Silverman, 1992). The CGC was also seen in auroral observations from 450 AD to 1450 AD. It thus appears that the magnetic field generated by the solar dynamo has a quasi-periodic variation of about 100 years, the cause of which demands future study. In this talk we will review the evidence that the peculiar behavior noticed during 23/24 minimum was a CGC minimum. We will describe the CGC and develop criteria to distinguish it from Grand Minima such as the Maunder Minimum. When these criteria are applied to the observations, the CGC hypothesis is clearly favored. We will discuss possible models of non-linear dynamos that can explain the origin of the CGC.

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