Polarimetry and spectroscopy of a simple sunspot. I - On the magnetic field of a sunspot penumbra

Details Polarimetry and spectroscopy of a simple sunspot. I - On the magnetic field of a sunspot penumbra Polarimetry and spectroscopy of a simple sunspot. I - On the magnetic field of a sunspot penumbra

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264l..27s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. L27-L30.

Astronomy and Astrophysics

Astrophysics

55

Astronomical Polarimetry, Solar Magnetic Field, Solar Spectra, Sunspots, Penumbras, Solar Activity

Scientific paper

We investigate the magnetic field structure of a medium sized sunspot using high resolution magnetograms and spectrograms and derive a relationship between the brightness of penumbral structures and the inclination of the magnetic field. The field inclination to the spot normal is larger in the dark structures than in the bright ones. We show that the field strength does not vary between dark and bright structures. At the inner penumbral boundary the field strength is 2000 Gauss and about 1000 Gauss at the outer penumbral edge. The line-of sight component of the material flow decreases rapidly within one arcsecond at the photospheric boundary of the spot.

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