Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989acasn..30..194z&link_type=abstract
(Acta Astronomica Sinica, vol. 30, no. 2, 1989, p. 194-207) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 14, March
Astronomy and Astrophysics
Astrophysics
Fine Structure, Magnetic Diffusion, Magnetohydrodynamic Stability, Solar Activity, Solar Magnetic Field, Sunspots, Magnetic Signatures, Temporal Distribution
Scientific paper
Continuous observations over five days with the magnetic field telescope at Huairou yielded some clear characteristics of the fine structures in sunspot active regions. Starting from magnetic diffusivity being a function of temperature and using the induction equation, the cause of the fine structure was investigated. The linear perturbation of the MHD equations was used to find the instability mode. This gives rise to inhomogeneous structures in the originally smooth magnetic field and is the cause of the fine structures. The observed fibrilles are about 1.5 to 3.0 arcsec, or 1000 to 2000 km in size, whereas, with certain typical values of sunspot parameters the theoretical lower limit for the fine structures is about 220 km, in agreement with some observational estimates.
Ai Guo-Xiang
Qian Jing-Kui
Zhaou Dao-Qi
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