Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..227b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 227-231. Sponsorship: Swiss National Science Founda
Astronomy and Astrophysics
Astrophysics
4
Circular Polarization, Noise Storms, Plasma Density, Plasma Waves, Solar Corona, Solar Radio Emission, Microwaves, Optical Thickness, Radar Tracking, Solar Activity Effects
Scientific paper
A statistical method for background subtraction of polarization observations has been developed. It separates the signal from a background with a much larger time constant. The method has been applied to the continuum component of a noise storm at various frequencies. The circular polarization was found to be constant in frequency within the statistical error. Its average value in time and frequency was 89.0±1.5%. Well accepted assumptions are used to determine the fraction of the radiation emitted at the harmonic of the plasma frequency from observations. The resulting flux of the harmonic is not significantly different from zero. The observed flux of the fundamental is used to derive the plasma wave density in the source of the noise storm and to predict the flux at the harmonic from theory.
Benz Arnold O.
Zolliker P.
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