Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992cha%26a..16...60d&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 16, Issue 1, p. 60-70.
Astronomy and Astrophysics
Astrophysics
The Sun-Active Regions-Electric Current
Scientific paper
The charcteristics of an emerging current/magnetic flux system (CMFS) with delta structure near the neutral line of the active region AR 2372 of April 1980 are described and interpreted with a simple MHD theory. The main results are: (i) It is easy to identify the CMFS and to estimate its current from measurements of the transverse magnetic field and the derived current density map. (ii) The existence of an old potential field and its Lorentz force on the CMFS can explain its rotation and the formation of the sheared configuration along the neutral line. (iii) The CMFS looks like the current sheet in the neutral layer of the old longitudinal field, though it cannot be that. (iv) The shearing motion of the spots along the neutral line manifests the separating motion of the footpoints of the CMFS. (v) The top of the CMFS shows a rapid rise. (vi) Both the shearing motion and the rapid rise are caused by the m = 1 twist instability of the CMFS itself.
Ding You-Ji
Hong Qin-Fang
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