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- W1639797277 abstract "High-resolution observations of the full Stokes vec- tor in Fei spectral lines around 5250 u A obtained at the Swedish Vacuum Solar Telescope on La Palma with the ZIMPOL I Stokes polarimeter in a complex active region reveal the pres- ence of anomalously shaped Stokes profiles indicating the co- existence of at least two magnetic components within the same spatial resolution element. These Stokes profiles have been an- alyzed with an inversion code based on a 3-component atmo- sphericmodelwithtwomagneticandonefield-freecomponent. The fits to the observations in a magnetic region that resembles a small penumbra reveal the presence of a horizontal magnetic field component with an average field strength of B = 840 G, a mean filling factor of � =0 .12, and an average tempera- ture T = 5400 K at log�5000 = 1.5 embedded in the main penumbral magnetic field that has B = 1500 G, � =0 .56, and T = 4900 K. The horizontal component exhibits a mean outflowof2.7 km s 1 whichismainlyduetotheEvershedflow. In a region where there are strong downflows up to 7 km s 1 , we infer the possible presence of a shock front whose height changes along the slit. The height variation can be explained by a change of the gas pressure at the base of the photosphere below the shock front as proposed by Thomas & Montesinos (1991).Smallplageswithfieldstrengthsbelow900 Ghavebeen observedinthevicinityofsomepores.Finally,wepresentapuz- zlingfieldstructureattheboundarybetweentwoadjacentpores. Ambiguous results suggest that although the inversion code is able to successfully invert even very complex Stokes profiles, we are far from a complete description of the field structure in complexmagneticregions.Wewarnthatmagnetogramsandfits to data involving only a single magnetic component may hide the true complexity of the magnetic structure in at least some parts of active regions." @default.
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- W1639797277 date "1998-01-01" @default.
- W1639797277 modified "2023-09-22" @default.
- W1639797277 title "COMPLEX MAGNETIC FIELDS IN AN ACTIVE REGION" @default.
- W1639797277 hasPublicationYear "1998" @default.
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