Skip to main content
×
×
Home

Solar and stellar activity: diagnostics and indices

  • Philip G. Judge (a1) and Michael J. Thompson (a1)
Abstract

We summarize the fifty-year concerted effort to place the “activity” of the Sun in the context of the stars. As a working definition of solar activity in the context of stars, we adopt those globally–observable variations on time scales below thermal time scales, of ~105 yr for the convection zone. So defined, activity is dominated by magnetic–field evolution, including the 22–year Hale cycle, the typical time it takes for the quasi-periodic reversal in which the global magnetic–field takes place. This is accompanied by sunspot variations with 11 year periods, known since the time of Schwabe, as well as faster variations due to rotation of active regions and flaring. “Diagnostics and indices” are terms given to the indirect signatures of varying magnetic–fields, including the photometric (broad-band) variations associated with the sunspot cycle, and variations of the accompanying heated plasma in higher layers of stellar atmospheres seen at special optical wavelengths, and UV and X-ray wavelengths. Our attention is also focussed on the theme of the Symposium by examining evidence for deep and extended minima of stars, and placing the 70–year long solar Maunder Minimum into a stellar context.

    • 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.

      Solar and stellar activity: diagnostics and indices
      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.

      Solar and stellar activity: diagnostics and indices
      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.

      Solar and stellar activity: diagnostics and indices
      Available formats
      ×
Copyright
References
Hide All
Ayres, T. R. 1997, J. Geophys. Res., 102, 1641
Ayres, T. R., Judge, P. G., Saar, S. H., & Schmitt, J. H. M. M., 2008, ApJL, 678, L121
Baliunas, S. & Jastrow, R. 1990, Nature, 348, 520
Baliunas, S. L., Donahue, R. A., Soon, et al. , 1995, ApJ, 438, 269
Beer, J., Tobias, S., & Weiss, N. 1998, Solar Phys., 181, 237
Böhm-Vitense, E. 2007, ApJ, 657, 486
Brown, B. P., Browning, M. K., Brun, A. S. et al. , 2010, ApJ, 711, 424
Brown, B. P., Miesch, M. S., Browning, M. K., Brun, A. S., & Toomre, J. 2011, ApJ, 731, 69
Christensen-Dalsgaard, J. & Thompson, M. J. 2011, in Brummell, N. H., Brun, A. S., Miesch, M. S., & Ponty, Y. (Ed.), IAU Symposium, Vol. 271 of IAU Symposium, p. 32
Cincunegui, C., Díaz, R. F., & Mauas, P. J. D. 2007, A&A, 461, 1107
Durney, B. R., Mihalas, D., & Robinson, R. D. 1981, PASP, 93, 537
Fröhlich, C. 2011, Space Sci. Rev., http://dx.doi.org/10.1007/s11214-011-9780-1
García, R. A., Ceillier, T., Campante, et al. , 2011, ArXiv e-prints, number 1109.6488
Giampapa, M. S., Hall, J. C., Radick, R. R., & Baliunas, S. L. 2006, ApJ, 651, 444
Hall, J. C. 2008, Living Reviews in Solar Physics, 5, 2
Hall, J. C., Henry, G. W., Lockwood, G. W. et al. , 2009, Astron. J., 138, 312
Hall, J. C. & Lockwood, G. W. 2004, ApJL, 614, 942
Hufbauer, K. 1991, Exploring the sun: solar science since Galileo, Baltimore: JHU press
Judge, P. G. & Saar, S. H. 2007, ApJ, 663, 643
Judge, P. G., Solomon, S., & Ayres, T. R. 2003, ApJ, 593, 534
Livingston, W., White, O. R., Wallace, L., & Harvey, J. 2010, Mem. Ast. Sco. It., 81, 643
Lockwood, G. W., Skiff, B. A., Henry, G. W., Henry, et al. , 2007, ApJS, 171, 260
Metcalfe, T. & 33 co-authors 2012, ApJL, in press
Metcalfe, T. S., Basu, S., Henry, T. J. et al. , 2010, ApJL, 723, L213
Morgenthaler, A., Petit, P., Aurière, M. et al. , 2010, in Boissier, S., Heydari-Malayeri, M., Samadi, R., & Valls-Gabaud, D. (Ed.), SF2A-2010, 269
Noyes, R. W., Hartmann, L. W., Baliunas, S. L. et al. , 1984, ApJ, 279, 763
Parker, E. N. 1955, ApJ, 122, 293
Plachinda, S. I. & Tarasova, T. N. 2000, ApJ, 533, 1016
Radick, R. R., Lockwood, G. W., Skiff, B. A., & Baliunas, S. L. 1998, ApJS, 118, 239
Robrade, J., Schmitt, J. H. M. M., & Favata, F. 2005, A&A, 442, 315
Robrade, J., Schmitt, J. H. M. M., & Hempelmann, A. 2007, Mem. Ast. Sco. It., 78, 311
Rottman, G. 2006, Space Sci. Rev., 125, 39
Saar, S. H. & Brandenburg, A. 1999, ApJ, 524, 295
Salabert, D., Jiménez-Reyes, S. J., & Tomczyk, S. 2003, A&A, 408, 729
Schmitt, J. H. M. M., 1997, A&A, 318, 215
Schrijver, C. J. & Harvey, K. L. 1994, Solar Phys., 150, 1
Schrijver, C. J., Livingston, W. C., Woods, T. N., & Mewaldt, R. A. 2011, GRL, 38, 6701
Schrijver, C. J. & Zwaan, C. 2000, Solar and Stellar Magnetic Activity, Cambridge Univ. Press, Cambridge, UK
Semel, M. 1989, Astron. Astrophys., 225, 456
Spruit, H. C. 2011, in Miralles, M. P. & Sánchez Almeida, J. (Ed.), The Sun, the Solar Wind, and the Heliosphere, IAGA Special Sopron Book Series, Vol. 4. Berlin: Springer, 39
Stern, R. A., Alexander, D., & Acton, L. W. 2003, in Brown, A., Harper, G. M., & Ayres, T. R. (Ed.), 12th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun, 12, 906
Wilson, O. C. 1968, ApJ, 153, 221
Wright, J. T. 2004, Astron. J., 128, 1273
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Proceedings of the International Astronomical Union
  • ISSN: 1743-9213
  • EISSN: 1743-9221
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords:

Metrics

Full text views

Total number of HTML views: 2
Total number of PDF views: 55 *
Loading metrics...

Abstract views

Total abstract views: 72 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 25th May 2018. This data will be updated every 24 hours.