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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    sunrise
    oscillation
    oscillations
    solar observatories
    wavelet analysis
    balloons
    tendencies
    observatory
    perturbation
    high resolution

    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., ... 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

    Oscillations on Width and Intensity of Slender Ca II H Fibrils from Sunrise/SuFI. / Gafeira, R.; Jafarzadeh, S.; Solanki, S. K.; Lagg, A.; Van Noort, M.; Barthol, P.; Rodríguez, J. Blanco; Del Toro Iniesta, J. C.; Gandorfer, A.; Gizon, Laurent; Hirzberger, J.; Knölker, M.; Suárez, D. Orozco; Riethmüller, T. L.; Schmidt, W.

    In: Astrophysical Journal, Supplement Series, Vol. 229, No. 1, 7, 01.03.2017.

    Research output: Contribution to journalArticle

    Gafeira, R, Jafarzadeh, S, Solanki, SK, Lagg, A, Van Noort, M, Barthol, P, Rodríguez, JB, Del Toro Iniesta, JC, Gandorfer, A, Gizon, L, Hirzberger, J, Knölker, M, Suárez, DO, Riethmüller, TL & Schmidt, W 2017, 'Oscillations on Width and Intensity of Slender Ca II H Fibrils from Sunrise/SuFI', Astrophysical Journal, Supplement Series, vol. 229, no. 1, 7. https://doi.org/10.3847/1538-4365/229/1/7
    Gafeira, R. ; Jafarzadeh, S. ; Solanki, S. K. ; Lagg, A. ; Van Noort, M. ; Barthol, P. ; Rodríguez, J. Blanco ; Del Toro Iniesta, J. C. ; Gandorfer, A. ; Gizon, Laurent ; Hirzberger, J. ; Knölker, M. ; Suárez, D. Orozco ; Riethmüller, T. L. ; Schmidt, W. / Oscillations on Width and Intensity of Slender Ca II H Fibrils from Sunrise/SuFI. In: Astrophysical Journal, Supplement Series. 2017 ; Vol. 229, No. 1.
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