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Helicities in Solar Dynamo Theories: Space Weather Implications

Explore helicity separation in small-scale dynamos and its impact on space weather theories. Discover the concepts of magnetic helicity conservation and the relationship between small and large-scale dynamos. This session addresses the role of helicity in solar proxies and its influence in mirror-asymmetric media.

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Helicities in Solar Dynamo Theories: Space Weather Implications

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  1. Solar Helicities in Theory and Observations: Implications for Space Weather and Dynamo Theories NORDITA, Stockholm, Sweden, 04 – 08 March 2019 Helicity separation in small-scale dynamo D.Sokoloff Moscow University & IZMIRAM, Moscow, Russia E.Yushkov, A.Lukin P.Frick, Russia

  2. Stabilization of mean-field (say, solar) dynamo – helicity separation • Dynamo excited large-scale magnetic field is helical • Magnetic helicity conservation • Magnetic helicity of opposite signhave to be accumullated ibn small scale • It spoils dynamo action • Presumption: Small-scale dynamo does not contribiye in the helicity balance

  3. Diff. rotation or random P BT BP Mirror asymmetry or random P BP BT LARGE-SCALE DYNAMO Versus small-scale one There are imprints of small-scale dynamo in solar proxies

  4. THE MAIN MESSAGE OF THE TALK SMALL-SCALE DYNAMO CAN ACTS IN A MIRROR-ASYMMETRIC MEDIA In this case it contains helicity separation similar to the large-scale dynamo

  5. Small-scale dynamo • Basic equation - Kazantsev 1967. • Intensively investigated in 80-th and less popular later

  6. If the medm is mirror asymmetric. Small-scale magnetic field becomes helical. Helicity separation

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