Synchrotron emissivity from mildly relativistic particles

Details Synchrotron emissivity from mildly relativistic particles Synchrotron emissivity from mildly relativistic particles

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981semr.rept.....p&link_type=abstract

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Astronomy and Astrophysics

Astrophysics

Emissivity, Energy Spectra, Particle Flux Density, Relativistic Particles, Synchrotron Radiation, Approximation, Astrophysics, Pitch (Inclination), Plasmas (Physics)

Scientific paper

Approximate analytic expressions are presented for evaluation of the frequency and angular dependence of synchrotron emissivity from mildly relativistic particles with arbitrary energy spectrum and pitch angle distribution in a given magnetic field. Results agree with previous expressions for a nonrelativistic Maxwellian particle distribution, and when extrapolated to nonrelativistic and extreme relativistic regimes, they also agree with the previous expressions obtained under those limiting conditions. The results from the analytic expression are compared with results from detailed numerical evaluations. Excellent agreement is found not only at frequencies large compared to the gyro-frequency but also at lower frequencies, in fact, all the way down to the gyro-frequency, where the analytic approximations are expected to be less accurate.

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