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Article Contents
1 Introduction
2 Observational techniques and data
3 Definition of the the tilt angle $\varphi $ and mean current helicity $<{\vec h}_{\vert\vert}>$
4 Relationship between the sign of the tilt angle and the sign of the mean current helicity $<{\vec h}_{\vert\vert}>$
5 Distribution of active regions with different chirality
6 Distribution of 62 major X-ray flares in the 22nd activity cycle
7 Conclusions and discussions
References
Copyright ESO 2001
Published by EDP Sciences