Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...115...90h&link_type=abstract
Astronomy and Astrophysics, vol. 115, no. 1, Nov. 1982, p. 90-96. Research supported by the Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astrophysics
48
Cyclotron Radiation, Electron Transitions, Emission Spectra, Landau Factor, Plasma Radiation, Transition Probabilities, Distribution Functions, Magnetic Fields, Neutron Stars, Photons, Relativistic Electron Beams, X Ray Spectra
Scientific paper
A fully relativistic, quantum-electrodynamical derivation of the cyclotron emission rates in arbitrary magnetic fields is presented. Special attention is paid to the determination of the correct polarization states of the excited initial electron, since for a fixed Landau quantum number, the two degenerate levels are split up by the coupling to the photon field. The differential transition probabilities for deexcitations of electrons into lower Landau levels for these two independently decaying states are calculated. For the lowest Landau levels the total transition rates are numerically evaluated up to a magnetic field strength of 4.4 x 10 to the 9th T. Employing different electron distribution functions for strongly magnetized plasmas, photon emission spectra are explicitly obtained in the range around the cyclotron resonance which exhibit remarkable angle-dependent structures originating from relativistic kinematics.
Herold Heinz
Ruder Hanns
Wunner Guenter
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