EGU GENERAL ASSEMBLY Oesterreich, Wien, April 2012

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Presentation transcript:

EGU GENERAL ASSEMBLY Oesterreich, Wien, April 2012 Theory, Simulations and Observations of Magnetic Dynamos Long-term dynamics of solar cycle, geomagnetic reversals and fluctuations of dynamo governing parameters Dmitry Sokoloff Moscow, Russia In collaboration with D.Moss, I.Usoskin, V.Pipin, G.Sobko, V.Tutubalin

Magnetostrophic timescale

Gassendi La Hire Dalton

BP BT BT BP Parker Dynamo Ω Differential rotation α Mirror asymmetry Fluctuations of governing parameters. Alpha is weak and fluctuations are stronger (up to 20%) Novelty: long-term fluctuations Suggested by Hoyng in 90th

α-effect τ < v rot v > α = 3 E = αB

Normal cycle

Beginning of the Maunder minimum Gassendi Scheiner Picard Hevelius No spots Asymmetric cycle

Asymmetric dynamo wave End of the Maunder Minimum Picard La Hire No dynamo wave Asymmetric dynamo wave Normal cycle

Solar Cycle in XVIII cent.

Grand Minima

Geodynamo

Basic Regimes of Parker Dynamo

Field Reversals

Simulated and observed timescales