Elliptic Polarization of Synchrotron Radiation

Earlier calculations on the polarization characteristics of a distribution of ultrarelativistically gyrat- ing electrons emitting synchrotron radiation have been extended to the next order of approximation, and appropriate corrections made for the fundamental frequency at a field point. Calculations by Roberts and Komesaroff of the degree of circular polarization have been corrected, and comparisons made with observations, particularly of the Crab Nebula Here it appears possible that recent 38 Mc/s observations are consistent with the results obtained and a magnetic field of magnitude 1O~ gauss; further calcula- tions are necessary before valid comparisons can be made with recently reported optical measurements