Solar neutron observations and their relation to solar flare acceleration problems

The current observational knowledge on the production of neutrons in association with solar flares is reviewed. From a study of the observations, it is shown that unique information can be obtained on the spectral properties of accelerated ions produced during the flare. Also, the abundance of He-3/H in the photosphere can be directly determined. The current interpretations of all available neutron observations and in particular highlight the uncertainties are also reviewed.