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Recent Advances on Solar Global Magnetism and Variability

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Abstract

We discuss recent observational, theoretical and numerical progress made in understanding the solar global magnetism and its short and long term variability. We discuss the physical process thought to be at the origin of the solar magnetic field and its 22-yr cycle, namely dynamo action, and the nonlinear interplay between convection, rotation, radiation and magnetic field, yielding modulations of the solar constant or of the large scale flows such as the torsional oscillations. We also discuss the role of the field parity and dynamo families in explaining the complex multipolar structure of the solar global magnetic field. We then present some key MHD processes acting in the deep radiative interior and discuss the probable topology of a primordial field there. Finally we summarize how helioseismology has contributed to these recent advances and how it could contribute to resolving current unsolved problems in solar global dynamics and magnetism.

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Acknowledgements

We acknowledge critical comments on solar global magnetism and dynamo by Prof. H.C. Spruit. We thank two anonymous referees for detailed and constructive comments. One of us (A.S.B) thanks the University of Kyoto, RIMS and Professors M. Yamada, K. Shibata, H. Isobe and S. Takehiro for their kind invitation in Fall 2013 during which this paper was finished. This work is partially supported by the NASA LWS grant NNX08AQ34G, by the ERC STARS2 project, by the French national program on Sun-Earth relationships (INSU/PNST) and by CNES Sun-Heliosphere program, and by a Consolidated Grant by the UK STFC (ST/J001627/1STFC). We acknowledge the support from ISSI Bern, for our participation in the workshop. The National Center for Atmospheric Research is sponsored by the National Science Foundation.

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  1. A. Strugarek

    Present address: Astronomy Dept., University of Montreal, Montreal, Canada

Authors and Affiliations

  1. AIM, CEA/CNRS/University of Paris 7, Bat 709, CEA-Saclay, 91191, Gif-sur-Yvette, France

    A. S. Brun & A. Strugarek

  2. Physics and Astronomy, University of Exeter, Stocker Road, EX4 4QL, Exeter, UK

    M. K. Browning

  3. HAO/NCAR, Boulder, CO, USA

    M. Dikpati

  4. Department of Earth and Planetary Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan

    H. Hotta

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Correspondence to A. S. Brun.

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Brun, A.S., Browning, M.K., Dikpati, M. et al. Recent Advances on Solar Global Magnetism and Variability. Space Sci Rev 196, 101–136 (2015). https://doi.org/10.1007/s11214-013-0028-0

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