Three-Dimensional View of Transient Horizontal Magnetic Fields in the Photosphere

0350104 - ASÚ 2011 RIV US eng J - Journal Article
Ishikawa, R. - Tsuneta, S. - Jurčák, Jan
Three-Dimensional View of Transient Horizontal Magnetic Fields in the Photosphere.
Astrophysical Journal. Roč. 713, č. 2 (2010), s. 1310-1321. ISSN 0004-637X. E-ISSN 1538-4357
R&D Projects: GA AV ČR IAA300030808
Institutional research plan: CEZ:AV0Z10030501
Keywords : magnetic fields * Sun * photosphere * granulation * surface magnetism
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 7.436, year: 2010

We infer the three-dimensional magnetic structure of a transient horizontal magnetic field (THMF) during its evolution through the photosphere using SIRGAUS inversion code. The SIRGAUS code allows for retrieval of information on the magnetic and thermodynamic parameters of the flux tube embedded in the atmosphere from the observed Stokes profiles. Spectropolarimetric observations of the quiet Sun at the disk center were performed with the Solar Optical Telescope on board Hinode with Fe i 630.2 nm lines. In three consecutive scans we observe an appearance and disappearance of a THMF. The results from the inversion of the Stokes spectra clearly point to the existence of a flux tube with magnetic field strength of ~400 G rising through the line-forming layer of the Fe i 630.2 nm lines. The vertical size of the tube is smaller than the thickness of the line-forming layer. The THMF has a clear Ω-shaped loop structure with the apex located near the edge of a granular cell.
Permanent Link: http://hdl.handle.net/11104/0190192