Temperature variations in the solar photosphere, Pt. 3, Kitt Peak measurements of the variations of photospheric line profiles with the heliographic latitude

• Published in: Solar physics Vol. 46; no. 1; pp. 29 - 52
• Main Authors: Caccin, B, Falciani, R, Donati-Falchi, A
• Format: Journal Article
• Language: English
• Published: 01.01.1976
• ISSN: 0038-0938

The observed center-to-limb variations of 11 weak line profiles with the HSRA and the microturbulence distribution given by Lites (1973), introducing an anisotropic macroturbulence (vertical component of 1.5 km sec and horizontal one of 2.3 km sec), were reproduced. The variations of the profiles with the heliographic latitude phi cannot be explained with temperature variations (it comes out that Delta T/T less than or equal to 10 super(-) super(3) ). Instead, a very small dependence upon phi , of the photospheric turbulence velocity field, is needed, the maximum of which, situated around phi [perspective to] 40-60 degrees . is of about 3-4% above the equatorial value. With the present measurements, however, it is not possible to distinguish between variations of the micro- and macroturbulence components of the total velocity field.