Discovery of unusual large group delay in microwave millisecond oscillating events

G. D. Fleishman, Q. J. Fu, G.-L. Huang, V. F. Melnikov, M. Wang
2002 Astronomy and Astrophysics  
Two events demonstrating periodic narrowband millisecond pulsations of radio emission both in intensity and polarization degree are analyzed. Large time delays between L-and R-polarization components are found. The radio emission is shown to be generated as unpolarized by a plasma mechanism at the second harmonic of the upper-hybrid frequency. Observed oscillations of the radiation polarization degree arise due to group delay between extraordinary and ordinary modes along the line of sight. The
more » ... theoretically predicted dependence of the group delay on frequency (∼f −3 ) agrees excellently with the observed delay frequency dependence. Physical parameters of the emission source and "delay site" are determined within the proposed model.
doi:10.1051/0004-6361:20020172 fatcat:pfx4odsrzbgdbfy2rc2zuvkdia