Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...697l.103s&link_type=abstract
The Astrophysical Journal Letters, Volume 697, Issue 2, pp. L103-L107 (2009).
Astronomy and Astrophysics
Astronomy
14
Sun: Activity, Sun: Filaments, Sun: Magnetic Fields
Scientific paper
Hinode high-quality vector magnetograms and G-band data are utilized to study the distributions of local twist α z and current helicity hc on the active region of NOAA 10930. The new findings are as follows. (1) The patches of positive and negative helicities were intermixed showing a mesh pattern in the umbra and a thread pattern in the penumbra. (2) For its main stable sunspot (MSS), there was a positive-helicity patch accounting for ~43% of the umbra area surrounding the inner umbra, which had a predominantly negative helicity. For its minor rotating sunspot (MRS), there was a negative-helicity patch appearing in the umbra. (3) The fine distributions of α z and hc on a penumbral filament indicated that it may be possible for the two opposite helicities to coexist in a filament and their magnitudes were nearly equivalent.
Hagino Masaoki
Liu Yu
Sakurai Takashi
Su Jiang-Tao
Suematsu Yoshinori
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