Skip to main content Accessibility help
×
Home

Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations

  • G. Guerrero (a1), P. K. Smolarkiewicz (a2), E. M. de Gouveia Dal Pino (a3), A. G. Kosovichev (a4), B. Zaire (a1) and N. N. Mansour (a5)...

Abstract

The role of tachoclines, the thin shear layers that separate solid body from differential rotation in the interior of late-type stars, in stellar dynamos is still controversial. In this work we discuss their relevance in view of recent results from global dynamo simulations performed with the EULAG-MHD code. The models have solar-like stratification and different rotation rates (i.e., different Rossby number). Three arguments supporting the key role of tachoclines are presented: the solar dynamo cycle period, the origin of torsional oscillations and the scaling law of stellar magnetic fields as function of the Rossby number. This scaling shows a regime where the field strength increases with the rotation and a saturated regime for fast rotating stars. These properties are better reproduced by models that consider the convection zone and a fraction of the radiative core, naturally developing a tachocline, than by those that consider only the convection zone.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations
      Available formats
      ×

Copyright

References

Hide All
Augustson, K., Brun, A. S., Miesch, M., & Toomre, J., 2015, ApJ, 809, 149
Brandenburg, A., 2005, ApJ, 625, 539
Brown, B. P., Browning, M. K., Brun, A. S., Miesch, M. S., & Toomre, J., 2008, ApJ, 689, 1354
Browning, M. K., 2008, ApJ, 676, 1262
Cally, P. S., Dikpati, M., & Gilman, P. A., 2003, ApJ, 582, 1190
Cameron, R. H. & Schüssler, M., 2016, A&A, 591, A46
Chatterjee, P., Nandy, D., & Choudhuri, A. R., 2004, A&A, 427, 1019
Dikpati, M. & Charbonneau, P., 1999, ApJ, 518, 508
Donati, J.-F. & Brown, S. F., 1997, A&A, 326, 1135
Ghizaru, M., Charbonneau, P., & Smolarkiewicz, P. K., 2010, ApJL, 715, L133
Guerrero, G. & de Gouveia Dal Pino, E. M., 2008, A&A, 485, 267
Guerrero, G., Dikpati, M., & de Gouveia Dal Pino, E. M., 2009, ApJ, 701, 725
Guerrero, G. & Käpylä, P. J., 2011, A&A, 533, A40
Guerrero, G., Smolarkiewicz, P. K., de Gouveia Dal Pino, E. M., Kosovichev, A. G., & Mansour, N. N. 2016a, ApJ, 819, 104
Guerrero, G., Smolarkiewicz, P. K., de Gouveia Dal Pino, E. M., Kosovichev, A. G., & Mansour, N. N. 2016b, ApJL, 828, L3
Guerrero, G., Zaire, B., Smolarkiewicz, P. K., et al. 2017
Käpylä, P. J., Mantere, M. J., & Brandenburg, A., 2012, ApJL, 755, L22
Komm, R., González Hernández, I., Howe, R., & Hill, F., 2015, Sol. Phys., 290, 3113
Landin, N. R., Mendes, L. T. S., & Vaz, L. P. R., 2010, A&A, 510, A46
Lawson, N., Strugarek, A., & Charbonneau, P. 2015, ArXiv e-prints
Miesch, M. S., Gilman, P. A., & Dikpati, M., 2007, ApJ, 168, 337
Miesch, M. S. & Hindman, B. W., 2011, ApJ, 743, 79
Muñoz-Jaramillo, A., Nandy, D., & Martens, P. C. H., 2011, ApJL, 727, L23
Parker, E. N., 1955, ApJ, 122, 293
Petit, P., Dintrans, B., Solanki, S. K., et al., 2008, MNRAS, 388, 80
Pizzolato, N., Maggio, A., Micela, G., Sciortino, S., & Ventura, P., 2003, A&A, 397, 147
Steenbeck, M., Krause, F., & Rädler, K.-H., 1966, Zeitschrift Naturforschung Teil A, 21, 369
Vidotto, A. A., Gregory, S. G., Jardine, M., et al., 2014, MNRAS, 441, 2361
Wright, N. J. & Drake, J. J., 2016, Nature, 535, 526
Wright, N. J., Drake, J. J., Mamajek, E. E., & Henry, G. W., 2011, ApJ, 743, 48
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Keywords

Are tachoclines important for solar and stellar dynamos? What can we learn from global simulations

  • G. Guerrero (a1), P. K. Smolarkiewicz (a2), E. M. de Gouveia Dal Pino (a3), A. G. Kosovichev (a4), B. Zaire (a1) and N. N. Mansour (a5)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed