High resolution polarimetry of the sun at 3.7 and 11.1 CM wavelengths

Details High resolution polarimetry of the sun at 3.7 and 11.1 CM wavelengths High resolution polarimetry of the sun at 3.7 and 11.1 CM wavelengths

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52...63l&link_type=abstract

Solar Physics, vol. 52, Apr. 1977, p. 63-68.

Astronomy and Astrophysics

Astronomy

4

Centimeter Waves, Circular Polarization, Polarimetry, Solar Radio Emission, High Resolution, Magnetoionics, Radio Astronomy, Solar Flares, Solar Magnetic Field, Sunspots

Scientific paper

The four Stokes parameters of solar radio emission at wavelengths of 3.7 and 11 cm were measured simultaneously with angular resolutions of 2.7 to 36.7 arcsec using a three-element interferometer system. Observed changes in circular polarization prior to flare emission and with observing wavelength are discussed. It is found that the degree of circular polarization in active region McMath No. 13926 remained low and constant during a 40-hr observing period, but dramatic increases in left-hand circularly polarized radiation occurred up to one hour before solar-flare emission from the same active region. Phase reversals of 90 deg in the sense of circular polarization were observed at the two wavelengths immediately after the flare event, and this is attributed to coupling between the two magnetoionic propagation modes. Fairly high values of electron density and magnetic-field intensity are suggested, e.g., an electron density in excess of 10 million per cu cm and a magnetic field of no more than 1000 G for radiation occurring in the first few harmonics of the gyrofrequency.

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