Fluctuations in Babcock-Leighton Dynamos. II. Revisiting the Gnevyshev-Ohl Rule

Details Fluctuations in Babcock-Leighton Dynamos. II. Revisiting the Gnevyshev-Ohl Rule Fluctuations in Babcock-Leighton Dynamos. II. Revisiting the Gnevyshev-Ohl Rule

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...658..657c&link_type=abstract

The Astrophysical Journal, Volume 658, Issue 1, pp. 657-662.

Astronomy and Astrophysics

Astronomy

9

Sun: Activity, Sun: Magnetic Fields

Scientific paper

The Gnevyshev-Ohl rule refers to a pattern of alternating higher and lower than average solar cycle amplitudes observed in the sunspot number record. In this paper, we show that such a pattern arises naturally in Babcock-Leighton models of the solar cycle as a consequence of the long time delay built into the dynamo regenerative loop. This is investigated using a simple but well-validated iterative map formulation, as well as a seasoned two-dimensional axisymmetric kinematic dynamo model. The good agreement between the results obtained via these two very different modeling approaches offers confidence that Gnevyshev-Ohl-like patterns of cycle amplitude fluctuations are a robust feature of this class of solar cycle models.

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