Solar Physics

, Volume 234, Issue 2, pp 203–212 | Cite as

Helicity Measurements from Two Magnetographs

  • A. A. PevtsovEmail author
  • J. P. Dun
  • H. Zhang


We use 270 pairs of vector magnetograms observed by Haleakala Stokes Polarimeter (HSP) and Solar Magnetic Field Telescope (SMFT) of Huairou Solar Observing Station from 1997 to 2000 to compare current helicity derived by these two instruments. We apply the same approach to both data sets to resolve 180 azimuth ambiguity and compute α coefficient of linear force-free field. After careful consideration of various aspects of both data sets, we find that in ≈80% of cases SMFT and HSP data result in the same sign of α, and the Pearson linear correlation coefficient between two data sets is rp = 0.64.


Azimuth Linear Correlation Careful Consideration Vector Magnetograms Pearson Linear Correlation 
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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  1. 1.National Solar ObservatorySunspotU.S.A.
  2. 2.National Astronomical ObservatoriesChinese Academy of SciencesBeijingChina

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