Effects of CO molecules on the outer solar atmosphere - A time-dependent approach

Details Effects of CO molecules on the outer solar atmosphere - A time-dependent approach Effects of CO molecules on the outer solar atmosphere - A time-dependent approach

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...142..393m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 142, no. 2, Jan. 1985, p. 393-400. Sponsorship: Deutsche Forschungsgemeinschaf

Astronomy and Astrophysics

Astrophysics

37

Carbon Monoxide, Chromosphere, Radiative Transfer, Solar Atmosphere, Solar Temperature, Time Dependence, Hydrodynamics, Solar Cooling, Solar Gravitation

Scientific paper

Carbon monoxide can be an important source of cooling near the solar temperature minimum. The influence of radiation in the 4.6 micron fundamental vibration-rotation band on the structure of the sun's outer atmosphere is investigated. The model calculations employ a 1-D hydrodynamical code in conjunction with a two-frequency treatment of radiative transfer. Resulting models have a bistable character. Radiative equilibrium atmospheres for a T(eff) less than 5800 K are dominated in outer layers by CO cooling which draws the temperature down to T less than about 3000 K. For hooter models, CO plays no important role. The chromosphere adjusts from one state to another in a time of the order of one hour. Acoustic heating destroys CO in the outermost parts of a model but for low and moderately high acoustic fluxes CO continues to dominate the region of the temperature minimum.

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