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Coronal holes are the observational manifestation of the solar magnetic fieldopen to the heliosphere and are of pivotal importance for our understanding ofthe origin and acceleration of the solar wind. Observations from space missionssuch as the Solar Dynamics Observatory now allow us to study coronal holes inunprecedented detail. Instrumental effects and other factors, however, pose achallenge to automatically detect coronal holes in solar imagery. The sciencecommunity addresses these challenges with different detection schemes. Untilnow, little attention has been paid to assessing the disagreement between theseschemes. In this COSPAR ISWAT initiative, we present a comparison of nineautomated detection schemes widely-applied in solar and space science. Westudy, specifically, a prevailing coronal hole observed by the AtmosphericImaging Assembly instrument on 2018 May 30. Our results indicate that thechoice of detection scheme has a significant effect on the location of thecoronal hole boundary. Physical properties in coronal holes such as the area,mean intensity, and mean magnetic field strength vary by a factor of up to 4.5between the maximum and minimum values. We conclude that our findings arerelevant for coronal hole research from the past decade, and are therefore ofinterest to the solar and space research community.

The Observational Uncertainty of Coronal Hole Boundaries in Automated Detection Schemes