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      Estimates of current helicity and tilt of solar active regions and Joy's law

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          Abstract

          The tilt angle, current helicity and twist of solar magnetic fields can be observed in solar active regions. We carried out estimates of these parameters by two ways. Firstly, we consider the model of turbulent convective cells (super-granules) which have a loop floating structure towards the surface of the Sun. Their helical properties are attained during the rising process in the rotating stratified convective zone. The other estimate is obtained from a simple mean-field dynamo model that accounts magnetic helicity conservation. The both values are shown to be capable to give important contributions to the observable tilt, helicity and twist.

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          Author and article information

          Journal
          17 June 2020
          Article
          2006.10197
          8f7ef835-9fca-44e3-912a-81b8749a0d80

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          Geomagnetism and Aeronomy, no. 8 (2020)
          16 pages, no figures; to appear in Geomagnetism and Aeronomy, in press
          astro-ph.SR

          Solar & Stellar astrophysics
          Solar & Stellar astrophysics

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