Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...462..534b&link_type=abstract
Astrophysical Journal v.462, p.534
Astronomy and Astrophysics
Astronomy
13
Sun: Magnetic Fields, Sun: Transition Region, Sun: Uv Radiation
Scientific paper
The quiet-Sun relation between the C iv resonance line parameters and the photospheric magnetic field is studied with a spatial resolution of 1" x 1". The material is ordered into groups according to the magnitude of the magnetic flux density, |B|, and conditional probabilities are calculated. We find that red shifted profiles with either high intensity, large Doppler shift, or large line broadening occupy an increasing fraction of the area when |B| increases. These results are contrasted by blueshifted profiles which indicate a slight decrease with increasing magnetic flux density. The similarity in the results obtained with magneto grams taken several hours before and after the UV data led us to suggest that the tendency for red shifted profiles to outnumber blueshifted profiles in quiet regions originates in the super-granular network.
Suggestions regarding the origin of the redshift phenomenon are briefly confronted with the observations. It appears difficult to explain the observations with models based on continuous gas flows. However, a model containing Alfvén wave pulses traveling from the corona toward the transition region promises to be compatible with the observations.
Brynildsen Nils
Kjeldseth-Moe Olav
Maltby Per
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