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Segmentation of Coronal Holes Using Active Contours Without Edges View all abstracts by submitter

R.T.James McAteer   Submitted: 2016-09-30 09:53

An application of active contours without edges is presented as an efficient and effective means of extracting and characterizing coronal holes. Coronal holes are regions of low-density plasma on the Sun with open magnetic field lines. The detection and characterization of these regions is important for testing theories of their formation and evolution, and also from a space weather perspective because they are the source of the fast solar wind. Coronal holes are detected in full-disk extreme ultraviolet (EUV) images of the corona obtained with the Solar Dynamics Observatory Atmospheric Imaging Assembly (SDO/AIA). The proposed method detects coronal boundaries without determining any fixed intensity value in the data. Instead, the active contour segmentation employs an energy-minimization in which coronal holes are assumed to have more homogeneous intensities than the surrounding active regions and quiet Sun. The segmented coronal holes tend to correspond to unipolar magnetic regions, are consistent with concurrent solar wind observations, and qualitatively match the coronal holes segmented by other methods. The means to identify a coronal hole without specifying a final intensity threshold may allow this algorithm to be more robust across multiple datasets, regardless of data type, resolution, and quality.

Authors: L.E. Boucheron, M. Valluri, R.T.J. McAteer

Publication Status: Published
Last Modified: 2016-10-03 12:33
Go to main E-Print page  A Statistical Study of CME Properties and of the Correlation Between Flares and CMEs over Solar Cycles 23 and 24  Oscillation of current sheets in the wake of a flux rope eruption observed by the Solar Dynamics Observatory  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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