Lowder, ChrisQui, JiongLeamon, Robert2017-03-302017-03-302016-12Lowder, Chris, Jiong Qui, and Robert Leamon. "Coronal Holes and Open Magnetic Flux over Cycles 23 and 24." Solar Physics 295, no. 18 (December 2016). DOI:https://dx.doi.org/10.1007/s11207-016-1041-8.0038-0938https://scholarworks.montana.edu/handle/1/12676As the observational signature of the footprints of solar magnetic field lines open into the heliosphere, coronal holes provide a critical measure of the structure and evolution of these lines. Using a combination of Solar and Heliospheric Observatory/Extreme ultraviolet Imaging Telescope (SOHO/EIT), Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA), and Solar Terrestrial Relations Observatory/Extreme Ultraviolet Imager (STEREO/EUVI A/B) extreme ultraviolet (EUV) observations spanning 1996 – 2015 (nearly two solar cycles), coronal holes are automatically detected and characterized. Coronal hole area distributions show distinct behavior in latitude, defining the domain of polar and low-latitude coronal holes. The northern and southern polar regions show a clear asymmetry, with a lag between hemispheres in the appearance and disappearance of polar coronal holes.en-US"http://creativecommons.org/licenses/by/4.0/legalcode"Article