Spectrum synthesis of chromospheric lines of SI II and SI III

Details Spectrum synthesis of chromospheric lines of SI II and SI III Spectrum synthesis of chromospheric lines of SI II and SI III

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..314t&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Feb. 15, 1978, p. 314-324.

Astronomy and Astrophysics

Astrophysics

26

Chromosphere, Emission Spectra, Silicon, Solar Atmosphere, Solar Spectra, Astronomical Models, Atmospheric Models, Radiative Transfer, Solar Limb, Temperature Profiles, Turbulence, Ultraviolet Spectra

Scientific paper

Profiles of emission lines of Si II and Si III in the EUV spectrum near the solar limb and near disk center are synthesized using a range of temperature and microturbulence models. Reasonably good agreement between computed and observed profiles near disk center is obtained with the Vernazza, Avrett, and Loeser (VAL, 1973) temperature model but with a modified microturbulence model. The adopted microturbulent velocity is equal to the mean thermal velocity of hydrogen temperatures above 7000 K and, at lower temperatures, decreases linearly to a value of 1 km/s in the low chromosphere. The 20,000-K temperature plateau in the VAL model is found to be of importance in determining the central intensities in the Si II lines at 1816, 1265, and 1533 A, and in determining the total intensity of the Si III line at 1206 A. The VAL temperature model with modified microturbulence does not give good agreement with the observed profiles near the solar limb. This failure is attributed to departures from spherical symmetry in the temperature and density model.

Affiliated with

Also associated with

No associations

Rating

Spectrum synthesis of chromospheric lines of SI II and SI III does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spectrum synthesis of chromospheric lines of SI II and SI III, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spectrum synthesis of chromospheric lines of SI II and SI III will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1034409