Physics
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982stin...8233315k&link_type=abstract
Unknown
Physics
Circular Polarization, Microwave Emission, Solar Radio Bursts, Time Measurement, Brightness Temperature, Magnetoionics, Millimeter Waves, Solar Flux, X Ray Spectroscopy
Scientific paper
Circular polarization of weak multistructured solar bursts was measured at mm microwaves with unprecedented sensitivity (0.03 sfu rms) and high time resolution (1ms). It was shown that sudden changes occur in the degree of polarization with time scales of 0.04 to 0.3 s. In most cases the degree of polarization attained maximum values before the maximum flux in both mm microwaves and hard X-rays with time scales of 0.04 to 1.0 s. The timing accuracy in determining the degree of polarization was 40 ms. Physical phenomena are discussed invoking one or a combination of various possible causes for the observed effects. The bursts at mm microwaves were weak compared to the contribution of the preexisting active regions, and therefore the changes in magnetoionic propagation conditions for emerging radiation plays an important role in the observed effects. Composite effects due to more than one polarizing mechanism or more than one polarized spots within the antenna beam are discussed.
Costa Joaquim E. Rezende
Dennis Brian R.
Kaufmann Patrik
Strauss Federico M.
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