Morphological properties of slender Ca II H fibrils observed by Sunrise II

We use seeing-free high spatial resolution Ca II H data obtained by the SUNRISE observatory to determine properties of slender fibrils in the lower solar chromosphere. In this work we use intensity images taken with the SUFI instrument in the Ca II H line during the second scientific flight of the SUNRISE observatory to identify and track elongated bright structures. After identification, we analyze theses structures to extract their morphological properties. We identify 598 slender Ca II H fibrils (SCFs) with an average width of around 180 km, length between 500 and 4000 km, average lifetime of approximate to 400 s, and average curvature of 0.002 arcsec(-1). The maximum lifetime of the SCFs within our time series of 57 minutes is approximate to 2000 s. We discuss similarities and differences of the SCFs with other small-scale, chromospheric structures such as spicules of type I and II, or Ca II K fibrils.

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Author Gafeira, R.
Lagg, A.
Solanki, S. K.
Jafarzadeh, S.
Noort, M. v.
Barthol, P.
Rodríguez, J. B.
Iniesta, J. C. D. T.
Gandorfer, A.
Gizon, L.
Hirzberger, J.
Knölker, Michael
Suárez, D. O.
Riethmüller, T. L.
Schmidt, W.
Publisher UCAR/NCAR - Library
Publication Date 2017-03-24T00:00:00
Digital Object Identifier (DOI) Not Assigned
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Topic Category geoscientificInformation
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Metadata Date 2025-07-11T19:50:32.099175
Metadata Record Identifier edu.ucar.opensky::articles:19672
Metadata Language eng; USA
Suggested Citation Gafeira, R., Lagg, A., Solanki, S. K., Jafarzadeh, S., Noort, M. v., Barthol, P., Rodríguez, J. B., Iniesta, J. C. D. T., Gandorfer, A., Gizon, L., Hirzberger, J., Knölker, Michael, Suárez, D. O., Riethmüller, T. L., Schmidt, W.. (2017). Morphological properties of slender Ca II H fibrils observed by Sunrise II. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7dr2x9d. Accessed 16 August 2025.

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