SIMPLIFIED FORMULAS OF QUANTUM CYCLOTRON RADIATION

Using a semi-classical quantum theory of the cyclotron radiation of a nonrelativistic thermal electron in a very strong magnetic field, we p resent the simplified formulae of the absorption coefficient of cyclot ron resonance k(nu) and the absorption and/or scattering cross section of cyclotron resonance sigma(nu) at base frequency omega(B) = eB/m(o) c in the quadrupole approximation. The results can be conveniently use d for studying the ''magnetic inverse-Compton scattering'', an importa nt radiation mechanism in gamma-ray astronomy. (C) 1997 Elsevier Scien ce B.V.