Multiheight Analysis of Asymmetric Stokes Profiles in a Solar Active Region

Details Multiheight Analysis of Asymmetric Stokes Profiles in a Solar Active Region Multiheight Analysis of Asymmetric Stokes Profiles in a Solar Active Region

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp51d..06d&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SP51D-06

Physics

7507 Chromosphere, 7524 Magnetic Fields, 7529 Photosphere

Scientific paper

Parameters characterizing Stokes asymmetries are derived from full Stokes I,Q,U,V spectra of FeI λλ 630.15, 630.25~nm line pair (formed at two different heights in the photosphere) and MgI b 517.27~nm line (formed at lower chromosphere) in a solar active region near disc center. The spectropolarimetric observations were taken with the National Solar Observatory/High Altitude Observatory Advanced Stokes Polarimeter. The observed active region consists of a α sunspot, a δ sunspot, several pores and granulation. The line center shifts and bi-sectors derived from Stokes-I profiles describe the line-of-sight Doppler velocity and Stokes-I asymmetry, respectively. Stokes-V amplitude and area asymmetries are defined by the normalized difference of respective quantities between blue and red lobes of circular polarization profiles. The same can be derived from linear polarization profiles ([Q2+U2]1/2). The Stokes asymmetries are compared for different regions and at multiple heights. Neutral line regions of the δ spot and outer penumbral regions show distinct large Stokes asymmetries. Both Stokes-V amplitude and area asymmetries become larger from lower to higher atmosphere in neutral line regions that have strong transverse field and mixed polarities. The Stokes-V area asymmetry of outer edge of penumbrae changes from positive in the photosphere to negative in lower chromosphere. Detailed results and interpretation will be presented.

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