THE infra-red catastrophe in the higher-order radiative corrections to electron scattering has been well known and shown to disappear when the virtual processes are considered along with the real ...
THE X-ray radiation of the Sun in the spectral range 60 Å < λ < 0.1 Å has been investigated since 1948. A wealth of data has been obtained on the radiation of both the quiet Sun (60 > λ > 5 Å) and of ...