Advertisement

Sunspot Magnetic Oscillations: Comparison between Observations and Models

  • I. Rüedi
  • S. K. Solanki
  • T. Bogdan
  • P. Cally
Part of the Astrophysics and Space Science Library book series (ASSL, volume 243)

Abstract

We compare observed timeseries of sunspot magnetograms with those expected from a theoretical model of sunspot oscillations. We show that the amplitudes of the observed oscillations are compatible with the predictions of the theoretical model of magnetoacoustic oscillations. For the particular sunspot oscillation model used, our analysis suggests that most of the observed power in the magnetogram-signal oscillations is actually due to cross-talk from the temperature and density oscillations associated with the magnetoacoustic wave.

The specificities of the observing procedure turn out to be of central importance for the assignment of the observed oscillations to a specific wave type.

Key words

Sun: magnetic fields Oscillations Photosphere sunspots 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Balthasar H., Schmidt W., 1993, A&A 279, 243ADSGoogle Scholar
  2. Bruls J.H.M.J., Solanki S.K., Carlsson M., Rutten R.J., 1995, A&A 293, 225ADSGoogle Scholar
  3. Cally P.S., Bogdan T.J., 1993, ApJ 402, 721ADSCrossRefGoogle Scholar
  4. Cally P.S., Bogdan T.J., Zweibel E.G., 1994, ApJ 437, 505ADSCrossRefGoogle Scholar
  5. Horn T., Staude J., Landgraf V., 1997, Solar Phys. 172, 69ADSCrossRefGoogle Scholar
  6. Lites B.W., Thomas J.H., Bogdan T.J., Cally P.S., 1998, ApJ 497, 464ADSCrossRefGoogle Scholar
  7. Maltby P., Avrett E.H., Carlsson M., Kjeldseth-Moe O., Kurucz R.L., Loeser R., 1986, ApJ 306, 284ADSCrossRefGoogle Scholar
  8. Norton A.A., Ulrich R.K., Bogart R.S., Bush R.I., Hoeksema J.T., 1998, in: New Eyes to See Inside the Sun and Stars, F.-L. Deubner, J. Christensen-Dalsgaard, D. Kurtz (Eds.), Kluwer, Dordrecht, IAU Symp. 185, 453Google Scholar
  9. Norton A.A., et al.,1999, in: 3rd Advances in Solar Physics Euroconference, Solar magnetic fields and oscillations, B. Schmieder, A. Hofmann, J. Staude (Eds.), Astron. Soc. Pacific Conf. Ser., in pressGoogle Scholar
  10. Rüedi I., Solanki S.K., Livingston W., 1995, A&A 293, 252Google Scholar
  11. Rüedi I., Solanki S.K., Stenflo J.O., Tarbell T., Scherrer P.H., 1998, A&A 335, L97ADSGoogle Scholar
  12. Rüedi I., Solanki S.K., 1999, in: 3rd Advances in Solar Physics Euroconference, Solar magnetic fields and oscillations, B. Schmieder, A. Hofmann, J. Staude (Eds.), Astron. Soc. Pacific Conf. Ser., in pressGoogle Scholar
  13. Scherrer P.H., Bogart R.S., Bush R.I., et al., 1995, Solar Phys. 162, 129ADSCrossRefGoogle Scholar
  14. Staude J., 1999, in: 3rd Advances in Solar Physics Euroconference, Solar magnetic fields and oscillations, B. Schmieder, A. Hofmann, J. Staude (Eds.), Astron. Soc. Pacific Conf. Ser., in pressGoogle Scholar
  15. Ulrich R.K., 1996, ApJ 465, 436ADSCrossRefGoogle Scholar
  16. Wittmann A.D., 1974, Solar Phys. 36, 29ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1999

Authors and Affiliations

  • I. Rüedi
    • 1
  • S. K. Solanki
    • 1
  • T. Bogdan
    • 2
  • P. Cally
    • 3
  1. 1.Institute of AstronomyETH-ZentrumZürichSwitzerland
  2. 2.High Altitude ObservatoryNational Center for Atmospheric ResearchBoulderUSA
  3. 3.Department of MathematicsMonash UniversityClaytonAustralia

Personalised recommendations