A semi-empirical model of sunspot umbra

Details A semi-empirical model of sunspot umbra A semi-empirical model of sunspot umbra

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cha%26a..15...28d&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 15, Issue 1, p. 28-36.

Astronomy and Astrophysics

Astrophysics

1

The Sun-Sunspots-Model Atmosphere-Radiative Loss

Scientific paper

Based on data obtained with the Kitt Peak Observatory Solar Tower, we have constructed a semi-empirical model of sunspot umbra. Non-LTE calculation was used. The main features are: (1) The temperature structure of the corona and the transition region is similar to the VAL3C quiet sun model. (2) The chromosphere structure is characterized by a temperature plateau; the temperature in the upper layers ishigher than those of the quiet sun and the penumbra; (3) The minimum temperature is 3130 K, about 300 K less than that of the penumbra model. (4) the temperature structure of the photosphere is similar to those in previous models, while the micro-turbulent velocity is somewhat less.
We find there is no radiative balance in the whole atmosphere. The net radiative loss rate has a maximum in the middle chromosphere and it is negative in the temperature minimum region.

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