The Hemispheric Sign Rule of Current Helicity during the Rising Phase of Cycle 23

Journal of astrophysics and astronomy

G. X. Ai¹  H. Q. Zhang¹  S. D. Bao1¹ 

[1] Beijing Astronomical Observatory/National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100 012, China.$$

关键词: Sun: activity;    magnetic fields;    photosphere.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

We compute the signs of two different current helicity parameters (i.e., 𝛼best and 𝐻𝑐) for 87 active regions during the rise of cycle 23. The results indicate that 59% of the active regions in the northern hemisphere have negative 𝛼best and 65% in the southern hemisphere have positive. This is consistent with that of the cycle 22. However, the helicity parameter 𝐻𝑐 shows a weaker opposite hemispheric preference in the new solar cycle. Possible reasons are discussed.

【 授权许可】

Unknown