The decrease of penumbral velocity and magnetic field at the outer sunspot boundary

Details The decrease of penumbral velocity and magnetic field at the outer sunspot boundary The decrease of penumbral velocity and magnetic field at the outer sunspot boundary

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...208..303w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 208, no. 1-2, Jan. 1989, p. 303-306.

Astronomy and Astrophysics

Astrophysics

16

Digital Simulation, Penumbras, Solar Magnetic Field, Sunspots, Astronomical Photography, Gratings (Spectra), Smear

Scientific paper

Numerical simulation of atmospheric and instrumental smearing indicates that velocity and magnetic field disappear at the outer spot border within a length of maximally 1650 km and 2200 km, respectively. Accepting the (known) inclination of 84 deg, the corresponding height ranges of 165 and 220 km, respectively, are not compatible with the picture of a disappearance of both fields due to a kind of 'optical dilution' with height. Indication is given for a disappearance of the fields beyond an iso-tau discontinuity.

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