Original scientific paper
Identification of coronal holes and filament channels in SDO/AIA 193Å images via geometrical classification methods
M Reiss
; Institute of Physics, NAWI Graz, University of Graz
Manuela Temmer
; Institute of Physics, NAWI Graz, University of Graz
T. Rotter
; Institute of Physics, NAWI Graz, University of Graz
S. J. Hofmeister
; Institute of Physics, NAWI Graz, University of Graz
Astrid M. Veronig
; Institute of Physics, NAWI Graz, University of Graz
Abstract
In this study, we describe and evaluate shape measures for distinguishing between coronal holes and filament channels as observed in Extreme Ultraviolet (EUV) images of the Sun. For a set of well-observed coronal hole and filament channel regions extracted from SDO/AIA 193Å images we analyze their intrinsic morphology during the period 2011 to 2013, by using well known shape measures from the literature and newly developed geometrical classification methods. The results suggest an asymmetry in the morphology of filament channels giving support for the sheared arcade or weakly twisted flux rope model for filaments. We find that the proposed shape descriptors have the potential to reduce coronal hole classification errors and are eligible for screening techniques in order to improve the forecasting of solar wind high-speed streams from CH observations in solar EUV images.
Keywords
Solar corona; Solar wind; Shape measures and analysis
Hrčak ID:
142722
URI
Publication date:
22.12.2014.
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