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Oscillation analysis using optical flow: Application to an EUV movie of the solar corona
Authors:Samuel Gissot  J-F Hochedez  
Institution:aSolar Influences Data Analysis Centre, Royal Observatory of Belgium, Avenue Circulaire 3, B-1180 Brussels, Belgium;bUnité de Physique Théorique et de Physique Mathématique–FYMA, Université catholique de Louvain, Chemin du Cyclotron 2, B-1348 Louvain-la-Neuve, Belgium
Abstract:Movies of the solar corona in Extreme UltraViolet (EUV) bandpasses exhibit complex patterns of magnetically structured plasma features surrounding the solar photosphere. Among the various phenomena to be observed in the EUV movies, coronal oscillations are an essential process for determining physical parameters of the plasma. In this paper we demonstrate the ability of our motion estimation algorithm to explore and analyse the oscillating motions of coronal loops present in EUV image sequences. The motion fields of each image pair in the sequence are estimated; selected features are tracked using the motion estimation to form trajectories. The oscillating features are then selected from the Morlet wavelet analysis of the trajectories that provides parameters such as local oscillation period. The proposed method will be particularly useful to process datasets expected from new solar missions.
Keywords:Astrophysics  Sun  Corona  Methods  Optical flow  Regularisation  Feature tracking
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