Hostname: page-component-848d4c4894-sjtt6 Total loading time: 0 Render date: 2024-06-20T21:35:51.808Z Has data issue: false hasContentIssue false
  • English
  • Français

The Puzzling Dynamos of Stars: Recent Progress With Global Numerical Simulations

Published online by Cambridge University Press:  12 September 2017

Antoine Strugarek ,
Patrice Beaudoin ,
Paul Charbonneau  and
Allan S. Brun
Antoine Strugarek
Affiliation:
Laboratoire AIM Paris-Saclay, CEA/Irfu Université Paris-Diderot CNRS/INSU, F- 91191Gif-sur-Yvette email: antoine.strugarek@cea.fr Département de physique, Université de Montréal, C.P. 6128 Succ.Centre-Ville, Montréal, QC H3C-3J7, Canada
Patrice Beaudoin
Affiliation:
Département de physique, Université de Montréal, C.P. 6128 Succ.Centre-Ville, Montréal, QC H3C-3J7, Canada
Paul Charbonneau
Affiliation:
Département de physique, Université de Montréal, C.P. 6128 Succ.Centre-Ville, Montréal, QC H3C-3J7, Canada
Allan S. Brun
Affiliation:
Laboratoire AIM Paris-Saclay, CEA/Irfu Université Paris-Diderot CNRS/INSU, F- 91191Gif-sur-Yvette email: antoine.strugarek@cea.fr
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The origin of magnetic cycles in the Sun and other cool stars is one of the great theoretical challenge in stellar astrophysics that still resists our understanding. Ab-initio numerical simulations are today required to explore the extreme turbulent regime in which stars operate and sustain their large-scale, cyclic magnetic field. We report in this work on recent progresses made with high performance numerical simulations of global turbulent convective envelopes. We rapidly review previous prominent results from numerical simulations, and present for the first time a series of turbulent, global simulations producing regular magnetic cycles whose period varies systematically with the convective envelope parameters (rotation rate, convective luminosity). We find that the fundamentally non-linear character of the dynamo simulated in this work leads the magnetic cycle period to be inversely proportional to the Rossby number. These results promote an original interpretation of stellar magnetic cycles, and could help reconcile the cyclic behaviour of the Sun and other solar-type stars.

Keywords

Sun: magnetic fieldsSun: interiorstars: magnetic fields(magnetohydrodynamics:) MHD
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 1 - 11
Copyright
Copyright © International Astronomical Union 2017 

References

Augustson, K., Brun, A. S., Miesch, M., & Toomre, J. 2015, ApJ, 809, 149 Google Scholar
Augustson, K. C., Brun, A. S., & Toomre, J. 2013, ApJ, 777, 153 Google Scholar
Baliunas, S. L., Donahue, R. A., Soon, W. H., et al. 1995, ApJ, 438, 269 Google Scholar
Beaudoin, P., Charbonneau, P., Racine, E., & Smolarkiewicz, P. K. 2013, Sol. Phys., 282, 335 Google Scholar
Beaudoin, P., Simard, C., Cossette, J.-F., & Charbonneau, P. 2016, ApJ, 826, 138 Google Scholar
Bohm Vitense, E. 2007, ApJ, 657, 486 Google Scholar
Brown, B. P., Browning, M. K., Brun, A. S., Miesch, M. S., & Toomre, J. 2010, ApJ, 711, 424 Google Scholar
Brown, B. P., Miesch, M. S., Browning, M. K., Brun, A. S., & Toomre, J. 2011, ApJ, 731, 69 CrossRefGoogle Scholar
Browning, M. K., Miesch, M. S., Brun, A. S., & Toomre, J. 2006, ApJ, 648, L157 Google Scholar
Brun, A. S., Garcia, R. A., Houdek, G., Nandy, D., & Pinsonneault, M. 2015, Space Sci Rev, 196, 303 Google Scholar
Brun, A. S., Miesch, M. S., & Toomre, J. 2004, ApJ, 614, 1073 CrossRefGoogle Scholar
Brun, A. S. & Toomre, J. 2002, ApJ, 570, 865 CrossRefGoogle Scholar
Charbonneau, P. 2010, LRSP, 7, 3 Google Scholar
Cossette, J.-F., Charbonneau, P., Smolarkiewicz, P. K., & Rast, M. P. 2016, Submitted to ApJGoogle Scholar
Cranmer, S. R. 2012, Space Sci Rev, 172, 145 Google Scholar
DeRosa, M. L., Brun, A. S., & Hoeksema, J. T. 2012, ApJ, 757, 96 Google Scholar
Domaradzki, J. A., Xiao, Z., & Smolarkiewicz, P. K. 2003, PoF, 15, 3890 Google Scholar
Egeland, R., Metcalfe, T. S., Hall, J. C., & Henry, G. W. 2015, ApJ, 812, 12 Google Scholar
Featherstone, N. A. & Miesch, M. S. 2015, ApJ, 804, 67 CrossRefGoogle Scholar
Gallet, F., Charbonnel, C., Amard, L., et al. 2016, To appear in A&A, 1608Google Scholar
Gastine, T., Duarte, L., & Wicht, J. 2012, A&A, 546, 19 Google Scholar
Ghizaru, M., Charbonneau, P., & Smolarkiewicz, P. K. 2010, ApJL, 715, L133 Google Scholar
Gilman, P. A. 1983, ApJ Supp. Series, 53, 243 Google Scholar
Gilman, P. A. & Miller, J. 1981, ApJ Supp. Series, 46, 211 Google Scholar
Glatzmaier, G. A. 1984, J. Comp. Phys., 55, 461 Google Scholar
Glatzmaier, G. A. 1985, ApJ, 291, 300 Google Scholar
Gubbins, D. & Zhang, K. 1993, Physics of the Earth and Planetary Interiors, 75, 225 Google Scholar
Guerrero, G., Smolarkiewicz, P. K., de Gouveia Dal Pino, E. M., Kosovichev, A. G., & Mansour, N. N. 2016, ApJ, 819, 104 Google Scholar
Jones, C. A., Boronski, P., Brun, A. S., et al. 2011, Icarus, 216, 120 Google Scholar
Käpylä, P. J., Mantere, M. J., & Brandenburg, A. 2012, ApJ, 755, L22 Google Scholar
Käpylä, P. J., Mantere, M. J., Cole, E., Warnecke, J., & Brandenburg, A. 2013, ApJ, 778, 41 Google Scholar
Knobloch, E., Tobias, S. M., & Weiss, N. O. 1998, MNRAS, 297, 1123 Google Scholar
Lammer, H., Bredehöft, J. H., Coustenis, A., et al. 2009, The Astron. and Astrophys. Rev., 17, 181 Google Scholar
Lawson, N., Strugarek, A., & Charbonneau, P. 2015, ApJ, 813, 95 Google Scholar
McFadden, P. L., Merrill, R. T., McElhinny, M. W., & Lee, S. 1991, J. of Geophys. Res., 96, 3923 Google Scholar
Metcalfe, T. S., Egeland, R., & van Saders, J. 2016, ApJL, 826, L2 Google Scholar
Nelson, N. J., Brown, B. P., Brun, A. S., Miesch, M. S., & Toomre, J. 2011, ApJL, 739, L38 Google Scholar
Nelson, N. J., Brown, B. P., Brun, A. S., Miesch, M. S., & Toomre, J. 2013, ApJ, 762, 73 Google Scholar
Noyes, R. W., Weiss, N. O., & Vaughan, A. H. 1984, ApJ, 287, 769 Google Scholar
Prusa, J. M., Smolarkiewicz, P. K., & Wyszogrodzki, A. A. 2008, Computers & Fluids, 37, 1193 Google Scholar
Racine, É., Charbonneau, P., Ghizaru, M., Bouchat, A., & Smolarkiewicz, P. K. 2011, ApJ, 735, 46 CrossRefGoogle Scholar
Réville, V., Brun, A. S., Matt, S. P., Strugarek, A., & Pinto, R. F. 2015, ApJ, 798, 116 CrossRefGoogle Scholar
Saar, S. H. & Brandenburg, A. 1999, ApJ, 524, 295 Google Scholar
Salabert, D., Garcia, R. A., Beck, P. G., et al. 2016, A&A, 596, A31 Google Scholar
Schrinner, M., Petitdemange, L., & Dormy, E. 2012, ApJ, 752, 121 Google Scholar
Schrinner, M., Petitdemange, L., Raynaud, R., & Dormy, E. 2014, A&A, 564, A78 Google Scholar
Simard, C., Charbonneau, P., & Bouchat, A. 2013, ApJ, 768, 16 Google Scholar
Simard, C., Charbonneau, P., & Dubé, C. 2016, Adv. Spa. Res., 58, 1522 CrossRefGoogle Scholar
Smolarkiewicz, P. K. & Charbonneau, P. 2013, J. Comp. Phys., 236, 608 CrossRefGoogle Scholar
Strugarek, A., Beaudoin, P., Brun, A. S., et al. 2016, Adv. Spa. Res., 58, 1538 Google Scholar
Yadav, R. K., Christensen, U. R., Wolk, S. J., & Poppenhaeger, K. 2016, To appear in A&A, 1610.02721Google Scholar