Living Reviews in Solar Physics

"Coronal Holes"
Steven R. Cranmer  

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1 Introduction
2 Historical Overview
3 Properties of On-Disk Coronal Holes
4 Properties of Off-Limb Coronal Holes
4.1 Magnetic connectivity with the solar wind
4.2 Visible light observations
4.3 Ultraviolet spectroscopy
5 Coronal Heating and Solar Wind Acceleration
5.1 Sources of energy
5.2 The Wave/Turbulence-Driven (WTD) solar wind idea
5.3 The Reconnection/Loop-Opening (RLO) solar wind idea
5.4 Kinetic microphysics
6 Summary and Conclusions
7 Acknowledgements
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