Magnetic diffusion instability and the fine structures of soler active region

Details Magnetic diffusion instability and the fine structures of soler active region Magnetic diffusion instability and the fine structures of soler active region

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cha%26a..14...25z&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 14, Issue 1, p. 25-39.

Astronomy and Astrophysics

Astrophysics

1

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 we investigated the cause of the fine structures. Using linear perturbation of the MHD equations we found the instability mode. This gives rise to inhomogeneous structures in the originally smooth magnetic field and is the cause of the fine structures. Our observed fibrilles are about 1.5'' to 3.0'', or 1000 to 2000km in size, whereas, with certain typical values of sunspot parameters the theoretical lower limit for the fine structures is about 220km, in agreement with some observational estimates.

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