Photospheric and chromospheric magnetic field structure of a bipolar sunspot region

Details Photospheric and chromospheric magnetic field structure of a bipolar sunspot region Photospheric and chromospheric magnetic field structure of a bipolar sunspot region

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..648d&link_type=abstract

Astronomy and Astrophysics, Vol. 277, p. 648 (1993)

Astronomy and Astrophysics

Astrophysics

4

Sun: Magnetic Fields - Sun: Sunspots

Scientific paper

We present high resolution magnetograms of a large split spot and an opposite polarity pore in the 6102.7 Å Ca I photospheric line and in Hα and we discuss their fine structure. We found important differences between the photospheric and chromospheric magnetic field. Although the large spot was apparently unipolar at the photospheric level, we detected an opposite polarity region at the chromospheric level. We also found that there was hardly any trace of the pore magnetic field in the Hα magnetogram. These results cannot be interpreted in terms of constant-α magnetic fields. Finally we confirm the occurrence of filamentary magnetic structures in Hα at the location of the superpenumbra of the large spot.

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