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| Paper: |
Recent Advances in the Exploration of the Small-Scale Structure of the Quiet Solar Atmosphere: Vortex Flows, the Horizontal Magnetic Field, and the Stokes- V Line-Ratio Method |
| Volume: |
456, The Fifth Hinode Science Meeting |
| Page: |
3 |
| Authors: |
Steiner, O.; Rezaei, R. |
| Abstract: |
We review (i) observations and numerical simulations of vortical flows in the solar
atmosphere and (ii) measurements of the horizontal magnetic field in quiet Sun
regions. First, we discuss various manifestations of vortical flows and
emphasize the role of magnetic fields in mediating swirling motion created near the
solar surface to the higher layers of the photosphere and to the chromosphere.
We reexamine existing simulation runs of solar surface magnetoconvection with regard
to vortical flows and compare to previously obtained results.
Second, we reviews contradictory results and problems
associated with measuring the angular distribution of the magnetic field in quiet
Sun regions. Furthermore, we review the Stokes-V-amplitude ratio method for
the lines Fe i λλ 630.15 and 630.25 nm. We come to the conclusion
that the recently discovered two distinct populations in scatter plots of this ratio
must not bee interpreted in terms of “uncollapsed'' and “collapsed'' fields but
stem from weak granular magnetic fields and weak canopy fields located
at the boundaries between granules and the intergranular space. Based on
new simulation runs, we reaffirm earlier findings of a predominance of the
horizontal field components over the vertical one, particularly in the upper
photosphere and at the base of the chromosphere. |
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