Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482.1065b&link_type=abstract
Astrophysical Journal v.482, p.1065
Astronomy and Astrophysics
Astronomy
13
Line: Profiles, Polarization, Radiative Transfer, Sun: Faculae, Plages, Sun: Magnetic Fields, Sun: Sunspots
Scientific paper
Asymmetries in Stokes polarization spectral line profiles can be attributed to the existence of gradients in the velocity (and magnetic field) over the line-forming region. Models that solve the Stokes radiative transfer equations have incorporated both line-of-sight gradients and gradients perpendicular to the line of sight over the resolution element to produce the observed asymmetries. There have been only a few systematic studies of how these Stokes profile asymmetries vary across spatial structures and as a function of the amplitude of the velocity and magnetic fields, and very little statistical information is available. We present observational results from high spectral and spatial resolution Stokes V profile measurements made in an active region located near disk center and present correlations between the amplitude of the Stokes V asymmetry, the magnetic field strength, and line shifts and line asymmetries observed in the Stokes I profile. In regions where the field strength exceeds a few hundred gauss, we find a good correlation between the amplitude of the measured asymmetry in Stokes V and the observed shifts of the Stokes I profile. We also find a correlation between the asymmetry of the Stokes I profile and the amplitude of the Stokes V profile asymmetry.
Balasubramaniam K. S.
Keil Stephen L.
Tomczyk Steve
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