GRAND MINIMA AND NORTH-SOUTH ASYMMETRY OF SOLAR ACTIVITY

A solar-type dynamo model in a spherical shell is developed with allowance for random dependence of the poloidal field generation mechanism on time and latitude. The model shows repeatable epochs of a strongly decreased amplitude of magnetic cycles similar to the Maunder minimum of solar activity. R...

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Bibliographic Details
Published in:The Astrophysical journal 2013-11, Vol.777 (1), p.1-8
Main Authors: Olemskoy, S V, KITCHATINOV, L L
Format: Article
Language:English
Subjects:
Allowances
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Asymmetry
Correlation
CORRELATIONS
Latitude
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
Minima
NORTH-SOUTH ASYMMETRY
RANDOMNESS
Rotating generators
SOLAR ACTIVITY
SPHERICAL CONFIGURATION
Statistics
SUN
SYMMETRY
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Summary:A solar-type dynamo model in a spherical shell is developed with allowance for random dependence of the poloidal field generation mechanism on time and latitude. The model shows repeatable epochs of a strongly decreased amplitude of magnetic cycles similar to the Maunder minimum of solar activity. Random dependence of dynamo parameters on latitude breaks the equatorial symmetry of generated fields. The model shows the correlation of the occurrence of grand minima with deviations in the dynamo field from dipolar parity. An increased north-south asymmetry of magnetic activity can, therefore, be an indicator of transitions to grand minima. Qualitative interpretation of this correlation is suggested. Statistics of grand minima in the model are close to the Poisson random process, indicating that the onset of a grand minimum is statistically independent of preceding minima.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/777/1/71