Other
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..337t&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 47, no. 3, p. 337-354
Other
19
Line Spectra, Photosphere, Solar Limb, Solar Rotation, Solar Spectra, Spectrum Analysis, Turbulence, Angular Velocity, Fitting, Iron, Spectral Resolution, Stellar Spectrophotometry, Velocity Distribution
Scientific paper
Profile analyses for a number of spectral lines in the solar flux spectrum (i.e. the Sun seen as a star) were performed using the multi-parameter fitting method, in order to examine the adequacy of the micro/macro-turbulence model and the rigid-rotation model usually for Doppler-type line-broadening in stellar spectroscopy. From the contours of saturated lines (100 mA less than or approximately = Wlambda less than or approximately = 200 mA), the microturbulence (xi), the radial-tangential macroturbulence (xiRT), and the rotational velocity (ve sin i) were successfully separated from each other and determined as xi = 0.5 +/- 0.2 km/s, xiRT = 2.3 +/- 0.4 km/s, and ve sin i = 2.0 +/- 0.3 km/s (consistent with the actual synodic equatorial velocity of 1.9 km/s). Then, equipped with these given results of xi and ve sin i, this method was further applied to many weak or moderately strong Fe I/Fe II lines (Wlambda less than or approximately = 100 mA) in order to diagnose the behavior of xiRT in the solar photosphere, which revealed and evident increase of xiRT with depth (i.e., from approximately 2 km/s at tau5000 approximately 10-2 to approximately 4 km/s at tau5000 approximately 1). This gradient of the xiRT variation is favorably compared with the so-far reported depth-dependence of unresolved turbulent motions determined from center-to-limb observations of weak-line profiles; quantitatively, however, our result appears to be slightly larger by approximately 1 km/s, which may be attributed to integrated effects of large-scale resolved motions (e.g., granulation or 300 s oscillation).
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