The Three-Dimensional Structure of Magnetic Fields and Electric Currents in an Active Region
Abstract
Active Region NOAA 9661 consisting of various magnetic features (alpha spot, delta spot, pores, and plages) was observed simultaneously in three spectral lines (FeI 630.25, 630.15, and MgI 517.27) using full Stokes spectro-polarimetry with Advanced Stokes Polarimeter at NSO/SP. The formation heights of the three spectral lines span from photosphere to the low chromosphere. The magnetic field vectors are inverted from Stokes parameters using advanced inversion codes. In particular, HeLIx code is used to invert MgI's observation because it is dedicated for chromospheric Stokes inversion. The inverted magnetic field vectors in multiple atmospheric layers enable us to derive the three dimensional structure of the magnetic fields, electric current densities, current helicities, and their height gradients.
Acknowledgments: This work is supported by NASA under grants NNX08AQ32G and NNX08AQ89G, and by NSF under grants ATM 05-48952 and ATM 07-16950.- Publication:
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AAS/Solar Physics Division Meeting #40
- Pub Date:
- May 2009
- Bibcode:
- 2009SPD....40.0904D