Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.1719g&link_type=abstract
American Astronomical Society, SPD meeting #42, #17.19; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The current helicity of the large-scale magnetic fields has been computed in the past by using reconstructed vector magnetograms. Such magnetograms were derived by using sequence of line-of-sight magnetograms (Pevtsov A. A., and Latushko S. M.: 2000) and were used for studying the helicity patterns during cycle 22 and 23. The reconstruction method, however, made several assumptions, and the meridional component could not be reconstructed very well. Full disk vector magnetograms, which are now available from VSM/SOLIS and HMI/SDO are very promising to make a systematic study of large scale helicity patterns during cycle 24, which is in its onset phase. In this paper we shall discuss our preliminary results about the large-scale helicity patterns in the beginning of cycle 24 using VSM/SOLIS and HMI/SDO full disk vector magnetograms.
Gusain Sanjay
Pevtsov Alexander
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