Hostname: page-component-586b7cd67f-dsjbd Total loading time: 0 Render date: 2024-12-01T11:02:52.870Z Has data issue: false hasContentIssue false
  • English
  • Français

Polarimetric Measurements of the Fine Structure of a Sunspot Penumbra

Published online by Cambridge University Press:  12 April 2016

J. Hofmann ,
F.-L. Deubner ,
B. Fleck  and
W. Schmidt
J. Hofmann
Affiliation:
Institut für Astronomie und Astrophysik der Universität Würzburg, Am Hubland, 8700 Würzburg, F.R.Germany
F.-L. Deubner
Affiliation:
Institut für Astronomie und Astrophysik der Universität Würzburg, Am Hubland, 8700 Würzburg, F.R.Germany
B. Fleck
Affiliation:
Institut für Astronomie und Astrophysik der Universität Würzburg, Am Hubland, 8700 Würzburg, F.R.Germany
W. Schmidt
Affiliation:
Kiepenheuer-Institut für Sonnenphysik, Schöneckstraße 6, 7800 Freiburg, F.R., Germany

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.

Observations of a fairly regular sunspot penumbra near disk center have been carried out using a Stokes V polarimeter at the German Vacuum-Tower-Telescope in Izaña, Tenerife. We obtained two-dimensional spectral data by scanning the limb oriented sector of the penumbra in steps of 1” with the slit parallel to the solar limb. From Stokes V and Stokes I spectra of four magnetic sensitive lines (Fe I 5247.1, Cr I 5247.6, Fe I 5250.2, and Fe I 5250.7) obtained with 1024 × 1024 pixel CCDs we have determined Doppler shifts and several magnetic parameters. The results of a correlation analysis point out a clear relation between continuum brightness and magnetic field inclination in the sense of steeper field lines in the bright penumbral filaments. There is also a doubtless connection between intensity and Doppler shift. We did find indications for a correlation between field strength and brightness which is not uniform across the penumbra, though.

Type
Session 1. Structure of Active Regions
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 44 - 47
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Beckers, J.M., and Schröter, E.H. 1969, Solar Phys., 10, 384 Google Scholar
Beckers, J.M. 1981, in The Sun as a Star, Jordan, S., NASA, Washington, 11 Google Scholar
Degenhardt, D., and Wiehr, E. 1991, A&A, 252, 821 Google Scholar
Küveler, G., and Wiehr, E. 1985, A&A, 142, 205 Google Scholar
Lites, B.W., Scharmer, G.B., and Skumanich, A. 1990, A&A, 355, 329 Google Scholar
Schmidt, H.U., Spruit, H.C., and Weiss, N.O. 1986, A&A, 158, 351 Google Scholar
Schmidt, W., Hofmann, A., Balthasar, H., Tarbell, T.D., and Frank, Z.A. 1992, A&A, 264, L27 Google Scholar
Schröter, E.H., Kentischer, T., and Münzer, H. 1989, in High Spatial Resolution Solar Observations, Lühe, O. v.d., Sacramento Peak Observatory, 299 Google Scholar
Wiehr, E., and Steìlmacher, D. 1989, A&A, 225, 528 Google Scholar