Oscillations on Width and Intensity of Slender Ca II H Fibrils from Sunrise/SuFI

R. Gafeira, S. Jafarzadeh, S. K. Solanki, A. Lagg, M. Van Noort, P. Barthol, J. Blanco Rodríguez, J. C. Del Toro Iniesta, A. Gandorfer, Laurent Gizon, J. Hirzberger, M. Knölker, D. Orozco Suárez, T. L. Riethmüller, W. Schmidt

Research output: Contribution to journalArticle

Abstract

We report the detection of oscillations in slender Ca ii H fibrils (SCFs) from high-resolution observations acquired with the Sunrise balloon-borne solar observatory. The SCFs show obvious oscillations in their intensity, but also their width. The oscillatory behaviors are investigated at several positions along the axes of the SCFs. A large majority of fibrils show signs of oscillations in intensity. Their periods and phase speeds are analyzed using a wavelet analysis. The width and intensity perturbations have overlapping distributions of the wave period. The obtained distributions have median values of the period of 32 ±17 s and 36 ±25 s, respectively. We find that the fluctuations of both parameters propagate in the SCFs with speeds of km s-1 and km s-1, respectively. Furthermore, the width and intensity oscillations have a strong tendency to be either in anti-phase or, to a smaller extent, in phase. This suggests that the oscillations of both parameters are caused by the same wave mode and that the waves are likely propagating. Taking all the evidence together, the most likely wave mode to explain all measurements and criteria is the fast sausage mode.

Original languageEnglish (US)
Article number7
JournalAstrophysical Journal, Supplement Series
Volume229
Issue number1
DOIs
StatePublished - Mar 1 2017

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Keywords

  • Sun: chromosphere
  • Sun: magnetic fields
  • Sun: oscillations
  • techniques: imaging spectroscopy

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Gafeira, R., Jafarzadeh, S., Solanki, S. K., Lagg, A., Van Noort, M., Barthol, P., Rodríguez, J. B., Del Toro Iniesta, J. C., Gandorfer, A., Gizon, L., Hirzberger, J., Knölker, M., Suárez, D. O., Riethmüller, T. L., & Schmidt, W. (2017). Oscillations on Width and Intensity of Slender Ca II H Fibrils from Sunrise/SuFI. Astrophysical Journal, Supplement Series, 229(1), [7]. https://doi.org/10.3847/1538-4365/229/1/7