Turbulent velocity in undisturbed and active photosphere

✍ Scribed by O. G. Badalyan; M. A. Livshits

• Publisher: Springer
• Year: 1972
• Tongue: English
• Weight: 496 KB
• Volume: 22
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00148697

✦ Synopsis

Profiles of weak Fraunhofer lines have been recorded photoelectrically in both the faculae and the undisturbed photosphere. The entrance slit of the double-pass spectrograph corresponded to 1" • 20" on the solar disk. Turbulent velocities were found by comparing half-widths of the observed profiles with those of model calculations. These latter were carried out with aid of an electronic computer for the Bilderberg Continuum Atmosphere (BCA) under the assumption of true absorption and depth independent turbulent velocities. Line-formation levels were derived from the contribution curves computed by the method of weighting functions. For the undisturbed photosphere a turbulent velocity of about 2.6 km/s was found with no appreciable increase with the depth. In facular filaments all lines formed above T-0.1 showed smaller turbulence velocities, the velocity differences being in the range between 0.2 and 0.6 km/s (see Table II).