Reconstructing Deconstruction: High-Velocity Cloud Distance Through   Disruption Morphology
  We present Arecibo L-band Feed Array 21-cm observations of a sub-complex of HVCs at the tip of the Anti-Center Complex. These observations show morphological details that point to interaction with the ambient halo medium and differential drag within the cloud sub-complex. We develop a new technique for measuring cloud distances, which relies upon these observed morphological and kinematic characteristics, and show that it is consistent with H-alpha distances. These results are consistent with distances to HVCs and halo densities derived from models in which HVCs are formed from cooling halo gas. 
J. E. G. Peek, M. E. Putman, Christopher F. McKee, Carl Heiles,   Snezana Stanimirovic