Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI

S. Jafarzadeh, S. K. Solanki, R. Gafeira, 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 present observations of transverse oscillations in slender Ca ii H fibrils (SCFs) in the lower solar chromosphere. We use a 1 hr long time series of high- (spatial and temporal-) resolution seeing-free observations in a 1.1 Å wide passband covering the line core of Ca ii H 3969 Å from the second flight of the Sunrise balloon-borne solar observatory. The entire field of view, spanning the polarity inversion line of an active region close to the solar disk center, is covered with bright, thin, and very dynamic fine structures. Our analysis reveals the prevalence of transverse waves in SCFs with median amplitudes and periods on the order of 2.4 ± 0.8 km s-1 and 83 ± 29 s, respectively (with standard deviations given as uncertainties). We find that the transverse waves often propagate along (parts of) the SCFs with median phase speeds of 9 ± 14 km s-1. While the propagation is only in one direction along the axis in some of the SCFs, propagating waves in both directions, as well as standing waves are also observed. The transverse oscillations are likely Alfvénic and are thought to be representative of magnetohydrodynamic kink waves. The wave propagation suggests that the rapid high-frequency transverse waves, often produced in the lower photosphere, can penetrate into the chromosphere with an estimated energy flux of ≈15 kW m-2. Characteristics of these waves differ from those reported for other fibrillar structures, which, however, were observed mainly in the upper solar chromosphere.

    Original languageEnglish (US)
    Article number9
    JournalAstrophysical Journal, Supplement Series
    Volume229
    Issue number1
    DOIs
    StatePublished - Mar 1 2017

    Fingerprint

    sunrise
    transverse oscillation
    transverse waves
    chromosphere
    oscillation
    solar observatories
    balloons
    photosphere
    temporal resolution
    standing waves
    magnetohydrodynamics
    field of view
    wave propagation
    standard deviation
    polarity
    sun
    coverings
    spatial resolution
    fine structure
    flight

    Keywords

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

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Jafarzadeh, S., Solanki, S. K., Gafeira, R., Noort, M. V., Barthol, P., Rodríguez, J. B., ... Schmidt, W. (2017). Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI. Astrophysical Journal, Supplement Series, 229(1), [9]. https://doi.org/10.3847/1538-4365/229/1/9

    Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI. / Jafarzadeh, S.; Solanki, S. K.; Gafeira, R.; Noort, M. Van; Barthol, P.; Rodríguez, J. Blanco; Iniesta, J. C.Del Toro; 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, 9, 01.03.2017.

    Research output: Contribution to journalArticle

    Jafarzadeh, S, Solanki, SK, Gafeira, R, Noort, MV, Barthol, P, Rodríguez, JB, Iniesta, JCDT, Gandorfer, A, Gizon, L, Hirzberger, J, Knölker, M, Suárez, DO, Riethmüller, TL & Schmidt, W 2017, 'Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI', Astrophysical Journal, Supplement Series, vol. 229, no. 1, 9. https://doi.org/10.3847/1538-4365/229/1/9
    Jafarzadeh, S. ; Solanki, S. K. ; Gafeira, R. ; Noort, M. Van ; Barthol, P. ; Rodríguez, J. Blanco ; Iniesta, J. C.Del Toro ; Gandorfer, A. ; Gizon, Laurent ; Hirzberger, J. ; Knölker, M. ; Suárez, D. Orozco ; Riethmüller, T. L. ; Schmidt, W. / Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI. In: Astrophysical Journal, Supplement Series. 2017 ; Vol. 229, No. 1.
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    AU - Noort, M. Van

    AU - Barthol, P.

    AU - Rodríguez, J. Blanco

    AU - Iniesta, J. C.Del Toro

    AU - Gandorfer, A.

    AU - Gizon, Laurent

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