Cometary Charge Exchange Diagnostics in UV and X-ray
  Since the initial discovery of cometary charge exchange emission, more than 20 comets have been observed with a variety of X-ray and UV observatories. This observational sample offers a broad variety of comets, solar wind environments and observational conditions. It clearly demonstrates that solar wind charge exchange emission provides a wealth of diagnostics, which are visible as spatial, temporal, and spectral emission features. We review the possibilities and limitations of each of those in this contribution. 
D. Bodewits, D. J. Christian, J. A. Carter, K. Dennerl, I. Ewing, R.   Hoekstra, S. T. Lepri, C. M. Lisse, and S. J. Wolk
astro-ph.EP astro-ph.HE physics.atom-ph