The Composition and Energy Spectra of High Energy Cosmic Rays
S. P. Swordy
University of Chicago, Chicago, USA

The existing paradigm of the origin of galactic cosmic rays places strong supernovae shocks as the acceleration site for this material. However, although EGRET has reported evidence for GeV gamma rays from some supernovae, it is still unclear if the signal is produced by locally intense cosmic rays. Recent observations at TeV energies have not managed to detect the emission expected to be produced by an enhanced hadronic cosmic ray density near these objects. Although non-thermal x-ray emissions have been detected and interpreted as synchrotron emission from locally intense electrons at energies up to ~100TeV, these results seem inconsistent with the electron source spectrum inferred by direct measurements. It remains the case that simple energetics provide the most convincing argument that supernovae power the bulk of the observed cosmic rays. The extent to which these issues can be supported by direct observations of high energy cosmic rays will be examined.