Radial filamentary structure in a sunspot umbra

Details Radial filamentary structure in a sunspot umbra Radial filamentary structure in a sunspot umbra

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.350...45l&link_type=abstract

Nature (ISSN 0028-0836), vol. 350, March 7, 1991, p. 45, 46.

Astronomy and Astrophysics

Astronomy

26

Solar Granulation, Sunspots, Umbras, Astronomical Photography, Magnetic Field Configurations, Magnetic Flux, Solar Magnetic Field

Scientific paper

Two white-light photographs of the solar disk, of different exposure, recently obtained during exceptional seeing conditions are presented. Combining the photographs resolves the umbra of one small sunspot into an approximately filamentary structure, connecting to the penumbra, along with featureless voids. A 'light bridge' partially spanning the spot has a broader underlying filamentary foundation that completes the crossing. The photographs suggest that the contemporary view of umbral structure as consisting primarily of granulation or 'umbral dots' is questionable. Filamentary brightness may be attributable to partly inclined field lines and the voids may be places where the field becomes perpendicular to the surface.

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