Atomic excitation by radiation in the presence of velocity fields in the solar chromosphere

Physics

Scientific paper

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Atmospheric Turbulence, Atomic Excitations, Chromosphere, Solar Spectra, Velocity Distribution, Absorption Spectra, Fine Structure, Ionizing Radiation, Line Spectra, Photosphere, Transition Temperature

Scientific paper

The effect of microturbulence and macroturbulence in the chromosphere on the excitation temperature of the multiplets 1-5 of ionized titanium was calculated in a two-level atomic approximation. The transitions were assumed to be radially optically thin, while the exciting radiation was taken to be the radiation observed on the disk. Calculations were based on the 1960 Gottingen photometric atlas, and the wavelength from Moore's (1959) table was used for the profile center at zero macroturbulence. Excitation temperature was calculated for velocity fields up to 25 km per sec. For macroturbulence and microturbulence velocities below 15 km per sec, the enhanced excitation temperature effect was little dependent on multiplet. The effect is strong for values of microturbulence generally admitted in the chromosphere. These results are in accord with observational data.

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