SOLARNET Conference: The Many Scales of the Magnetic Sun

The Interferometric Bidimensional Spectrometer (IBIS) at the Dunn Solar Telescope (DST) was employed to capture high spatial resolution spectral scans of a sunspot in the H-alpha line. These scans allowed for the examination of super-penumbral fibrils, including their transverse motions both parallel and perpendicular to the line of sight. Near ubiquitous transverse oscillations of the fibrils have been observed and statistics gathered on their properties, which are consistent with previous investigations. Further examination of cases demonstrating well-resolved fibril oscillations were performed, which allowed us to track their propagation velocities and associated energy flux along the length of the fibril. Additionally, analysis of the H-alpha line width has been performed, which is known to correlate with plasma temperature. This allowed for a unique investigation of whether the energy damped from the transverse fibril oscillations provides evidence of thermalisation of the local plasma. Here, I will report on the energy damping and associated fluctuations in the H-alpha line width, which we believe is evidence of MHD wave dissipation in the form of plasma thermalisation.