Asymmetry and line-parameter variations in granular-intergranular regions in 2D artificial granulation

Details Asymmetry and line-parameter variations in granular-intergranular regions in 2D artificial granulation Asymmetry and line-parameter variations in granular-intergranular regions in 2D artificial granulation

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997kfnt...13c..24g&link_type=abstract

Kinematika i Fizika Nebesnykh Tel, vol. 13, p. 24

Astronomy and Astrophysics

Astronomy

Solar Granulation, Line Spectra, Free Convection, Solar Convection (Astronomy), Solar Spectra, Spectral Correlation, Astronomical Models, Astronomical Photometry

Scientific paper

Two sets of 2D models of solar granulation are used to interpret published observations of the spectral lines of Fe I 491.154, 491.178, and 649.499 nm obtained with high spectral and spatial resolution over selected granular-intergranular regions. We study variations of continuum intensity, residual intensity in the line cores, Doppler velocities, and line asymmetries over granular-intergranular areas in the center of the solar disk, and compare the correlation between these parameters obtained from models with observational ones. It is found that 2D models of the solar granulation that describe the convective motions as quasi-stationary, cellular, and laminar with the system of quasi-column vertical photospheric velocities show the high correlation values between the line-parameter variations and cannot explain the observational behavior of spectral line characterstics over single granular-intergranular areas. A good reproduction of observational results can be found only by applying 2D models that treat the solar thermal convection as a fully nonstationary system with interacting flows.

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