THE FORMATION OF A MAGNETIC CHANNEL BY THE EMERGENCE OF CURRENT-CARRYING MAGNETIC FIELDS
- Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of)
- Space Weather Research Laboratory, New Jersey Institute of Technology, Newark, NJ 07102 (United States)
- Max-Planck Institute fuer Sonnensystemforschung, Max-Planck Strasse 2, 37191 Katlenburg-Lindau (Germany)
A magnetic channel-a series of polarity reversals separating elongated flux threads with opposite polarities-may be a manifestation of a highly non-potential magnetic configuration in active regions. To understand its formation, we have carried out a detailed analysis of the magnetic channel in AR 10930 using data taken by the Solar Optical Telescope/Hinode. As a result, we found upflows (-0.5 to -1.0 km s{sup -1}) and downflows (+1.5 to +2.0 km s{sup -1}) inside and at both tips of the thread, respectively, and a pair of strong vertical currents of opposite polarity along the channel. Moreover, our analysis of the nonlinear force-free fields constructed from the photospheric magnetic field indicates that the current density in the lower corona may have gradually increased as a result of the continuous emergence of the highly sheared flux along the channel. With these results, we suggest that the magnetic channel originates from the emergence of the twisted flux tube that has formed below the surface before the emergence.
- OSTI ID:
- 21455011
- Journal Information:
- Astrophysical Journal, Vol. 719, Issue 1; Other Information: DOI: 10.1088/0004-637X/719/1/403; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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