Umbral boundaries, convection, and the depth of sunspots

Details Umbral boundaries, convection, and the depth of sunspots Umbral boundaries, convection, and the depth of sunspots

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...50...49i&link_type=abstract

Solar Physics, vol. 50, Sept.-Oct. 1976, p. 49-63.

Physics

2

Convective Heat Transfer, Solar Temperature, Sunspots, Umbras, Boundaries, Flow Velocity, Integral Equations, Penumbras, Photosphere, Temperature Distribution

Scientific paper

The boundary between the umbra and penumbra of a sunspot is consistently observed to be very sharp, on the order of 500 km. Approximating the sunspot as a static region in a homogeneous medium with a radiative surface, temperature distributions resulting from a variety of convective motions exterior to the sunspot are calculated. The calculations suggest that, for the exterior convection to produce the observed boundary, the maximum depth of the region of inhibited convection below a sunspot umbra is on the order of 1,000 km.

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