A Quantitative Study on Magnetic Configuration for Active Regions |
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Authors: | Juan Guo Hongqi Zhang Oleg V Chumak Yu Liu |
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Institution: | (1) National Astronomical Observatories, Chinese Academy of Science, Beijing, 100012, China;(2) Sternberg Astronomical Institute (SAI), Moscow State University, Moscow, 119899, Russia;(3) Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822, USA |
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Abstract: | As compared with the Mount Wilson Magnetic Classification (MWMC), effective distance (d
E) is a useful parameter because it gives a quantitative measure of magnetic configuration in active regions. We have analyzed
magnetograms of 24 active regions of different types with MWMC. We have studied the evolution of magnetic fields of five active
regions using d
E, total flux (F
t) and tilt angle (Tilt) quantitatively. Furthermore, 43 flare-associated and 25 CME-associated active regions have been studied to investigate and
quantify the statistical correlation between flares/CMEs and the three parameters. The main results are as follows: (1) There
is a basic agreement between d
E and MWMC. (2) The evolution of magnetic fields can be described in three aspects quantitatively and accurately by the three
parameters, in particular by d
E on the analysis of δ-type active regions. (3) The high correlation between d
E and flares/CMEs means that d
E could be a promising measure to predict the flare-CME activity of active regions. |
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Keywords: | |
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