Astronomy and Astrophysics – Astronomy
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.0304p&link_type=abstract
American Astronomical Society, 200th AAS Meeting, #03.04; Bulletin of the American Astronomical Society, Vol. 34, p.642
Astronomy and Astrophysics
Astronomy
Scientific paper
We conduct detailed comparison of the current helicity measurements derived using observations from two vector magnetographs - Haleakala Stokes Polarimeter (HSP) at Mees Solar Observatory, and Solar Magnetic Fields Telescope (SMFT) at Huairou Solar Observing Station. The data, -- 269 pairs of vector magnetograms -- are observed in 1997-2000. We apply the same procedure to both data sets to resolve 180\arcdeg\ azimuth ambiguity and compute the linear force free field coefficient α . We find that in 205 (76%) of 269 cases the SMFT and HSP data show the same sign of α . Remaining 64 (24%) magnetograms that exhibit opposite sign of helicity in two instruments can be explained by several reasons including incorrect heliographic coordinates of active regions, lack of persistence in polarimetric measurements, spatial misalignment between Stokes I, Q, U and V maps, difference in noise level and active regions evolution.
Dun Jin-Ping
Pevtsov Alexander
Zhang Huazhong
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