Basic inconsistencies in models of interstellar cosmic-ray acceleration Academic Article uri icon


  • It is shown that if a model assumes that cosmic rays are preinjected into the galactic disk at subrelativistic energy E/sub inj/ and later accelerated in interstellar space, then for any given value of E/sub inj/, the model can be ruled out by observations. One implication is that if cosmic-ray acceleration is due to shocks, then the shocks themselves must make the cosmic rays directly from a thermal plasma, not merely accelerate ones that were previously injected by other glaactic processes. Given the observed energy dependence of the secondary-to-primary ratio, it is also shown that reacceleration by subsequent shocks is not a major effect.

publication date

  • January 1, 1980