Linear hydrodynamical equations coupled with radiative transfer in a non-isothermal atmosphere. II - Application to solar photospheric observations

Details Linear hydrodynamical equations coupled with radiative transfer in a non-isothermal atmosphere. II - Application to solar photospheric observations Linear hydrodynamical equations coupled with radiative transfer in a non-isothermal atmosphere. II - Application to solar photospheric observations

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...57..245s&link_type=abstract

Solar Physics, vol. 57, Apr. 1978, p. 245-253.

Physics

25

Atmospheric Models, Hydrodynamic Equations, Linear Equations, Photosphere, Radiative Heat Transfer, Solar Atmosphere, Atmospheric Temperature, Cooling, Line Spectra, Phase Shift, Relaxation Time, Solar Spectra

Scientific paper

In a previous paper the hydrodynamical and radiative-transfer equations were solved simultaneously, so that no atmospheric relaxation time had to be assumed. In this paper, that theory is used to interpret photospheric observations of the Mg I line at 5172 A. For periods between 400 and 140 s, the phase shifts observed between velocities and the phase shifts between intensity and velocity fluctuations are explained by the existence of radiative dissipation coupled with evanescent waves or upward-propagating waves, according to the frequency. For smaller periods partial or total reflections must be considered. The results relative to radiative dissipation are expressed in terms of the variation of a relaxation time with frequency through the atmosphere (optical depths at 500 A ranging from 0.001 to unity).

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