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Distribution of magnetic shear angle at the ascending phase of CYCLE 23

Distribution of magnetic shear angle at the ascending phase of CYCLE 23
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摘要 Using the vector magnetograms observed at Huairou Solar Observing Station of Na- tional Astronomical Observatories, the magnetic shear angles of solar active regions at the as- cending phase of cycle 23 (1996-2000) were calculated. It is found that the statistical distribution of the magnetic shear angles can be fitted well by Gaussian curves. And the dominant sign of the magnetic shear angles is negative (positive) in the northern (southern) hemisphere. It is consistent with the N-S sign asymmetry of force-free field constant a and current helicity. Using the vector magnetograms observed at Huairou Solar Observing Station of National Astronomical Observatories, the magnetic shear angles of solar active regions at the ascending phase of cycle 23 (1996-2000) were calculated. It is found that the statistical distribution of the magnetic shear angles can be fitted well by Gaussian curves. And the dominant sign of the magnetic shear angles is negative (positive) in the northern (southern) hemisphere. It is consistent with the N-S sign asymmetry of force-free field constant α and current helicity.
出处 《Science China Mathematics》 SCIE 2002年第z1期12-18,共7页 中国科学:数学(英文版)
基金 the National Natural Science Foundation of China (Grant Nos. 9791090 , 9791092).
关键词 SOLAR activity MAGNETIC SHEAR angles. solar activity, magnetic shear angles.
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参考文献9

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