Figure 5From: Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II periodA coronal hole and Alfvén waves from it. (Top panel) A midlatitude coronal hole during November 2009. (Bottom panel) A side view of the high-speed solar wind coming from a coronal hole. There is superradial expansion which leads to weaker speeds and smaller Alfvén wave amplitudes at the sides of the holes.Back to article page