Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428l..73a&link_type=abstract
The Astrophysical Journal, vol. 428, no. 2, pt. 2, p. L73-L76
Astronomy and Astrophysics
Astronomy
16
Faraday Effect, Linear Polarization, Magnetic Fields, Mapping, Microwave Emission, Radio Astronomy, Solar Corona, Bandwidth, Data Reduction, Dependence, Narrowband, Radio Telescopes, Wavelengths
Scientific paper
We report the detection for the first time of linear polarization in the microwave emission above a Solar Active Region. The observations were made with the Westerbork Synthesis Radio Telescope, taking advantage of the very small bandwidth of a multichannel spectral line receiver. The intensity of the Stokes parameter U, measured at several points close to the line of zero circular polarization, shows a clear sinusoidal trend as a function of lambda2, in accordance to what is expected from Faraday rotation. From the measured period, reasonable values of integral NBLdr were derived. Such observations could present in the future a unique way to measure coronal magnetic fields above Active Regions.
Alissandrakis Constantine E.
Chiuderi-Drago F.
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