Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...124..103d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 124, no. 1, July 1983, p. 103-107.
Astronomy and Astrophysics
Astrophysics
32
Circular Polarization, Solar Activity, Solar Radio Emission, Brightness Temperature, Limb Brightening, Solar Corona, Solar Flux Density, Solar Magnetic Field
Scientific paper
The authors present 1.4 GHz radio pictures of the sun made on 1981 September 26 using the VLA with a resolution of 40arcsec. Features observed include active regions, limb brightening, coronal holes and filament channels; all correspond well with features seen in Hα or He λ10830 Å, and can be explained as relative enhancements or depressions of free-free bremsstrahlung from the corona and upper transition region. The degree of circular polarization of the radiation from active regions ranges up to 0.2 and the sense corresponds, with a few exceptions, with the polarity of the photospheric magnetograms. The polarization is in the sense of the x-mode and is highest near the edges of active regions, whereas the brightness is highest near the line of zero polarization. The polarization can be explained by the different effects of the magnetic field on the bremsstrahlung opacities of the two modes; the observed values imply field strengths between about 20 and 70 Gauss near the boundaries of the active region corona.
Dulk George A.
Gary Dale E.
No associations
LandOfFree
The sun at 1.4 GHz - Intensity and polarization does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The sun at 1.4 GHz - Intensity and polarization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The sun at 1.4 GHz - Intensity and polarization will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1626438