Temporal variations in small scale chromospheric fibrils observed by Sunrise II

In June 2013 the SuFI instrument on board the Sunrise observatory recorded images in the narrow-band Ca II H filter at 396.8 nm of an active region with emerging magnetic flux for about one hour. These data of the solar chromosphere are characterized by a very high spatial resolution and unprecedented temporal stability. In this study we concentrate on small-scale chromospheric fibrils with diameters of down to 0.20 arcsec, close to the diffraction limit of the Sunrise telescope. The aim is to evaluate the morphological properties and intensity variations of the individual fibrils. This allows us to characterize properties like lifetime, elongation, curvature, brightness and its variation along and transversal to the fibrils. These parameters and their relation with the underlying magnetic field, measured with the Sunrise IMaX instrument, will shed light on the importance of these fibrils as the coupling agent between the photosphere and the corona.