Empirical sensitivity of the solar C I 5380 line to temperature changes in static and oscillating systems

Details Empirical sensitivity of the solar C I 5380 line to temperature changes in static and oscillating systems Empirical sensitivity of the solar C I 5380 line to temperature changes in static and oscillating systems

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214l.137h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 214, June 15, 1977, p. L137-L140. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

8

Photosphere, Solar Atmosphere, Solar Spectra, Spectral Line Width, Temperature Effects, Acoustic Propagation, Atmospheric Temperature, Solar Granulation, Solar Temperature

Scientific paper

The temperature sensitivity of the equivalent width of the photospheric line of C I at 5380.3 A in a steady-state system has been determined from observations and found to be in fair agreement with theoretical results. For an oscillating system, the ratio of the amplitude of the modulated part of the central line depth to the velocity amplitude was obtained from observations of the 5-minute oscillation. The temperature sensitivity of central line depth in this oscillating system was obtained from this ratio and from the relevant solutions for acoustic-wave propagation in the photosphere. This sensitivity was found to be essentially two order of magnitude below that for the steady-state system, diminishing the utility of this spectral line in a program looking for global oscillations. Implicit in this work is the use of relatively large temperature amplitudes deep in the photosphere. These amplitudes have been found theoretically to be associated with the 5-minute oscillations as a direct manifestation of the Kappamechanism operating in the hydrogen ionization zone.

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