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Temperature variations in the solar photosphere

III: Kitt Peak measurements of the variations of photospheric line profiles with the heliographic latitude

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Abstract

We reproduced 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).

The variations of the profiles with the heliographic latitude ϕ cannot be explained with temperature variations (it comes out that ΔT/T ⩽ 10−3), but we need instead a very small dependence on ϕ of the photospheric turbulence velocity field, the maximum of which, situated around ϕ ∼- 40°–60°, is of about 3–4%, above the equatorial value. With the present measurements, however, we are not able to distinguish between variations of the micro- and macroturbulence components of the total velocity field.

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Authors and Affiliations

  1. Capodimonte Astronomical Observatory, Via Moiariello 16, I 80131, Naples, Italy

    B. Caccin & R. Falciani

  2. Institute for Experimental Physics, Naples University, Italy

    B. Caccin & R. Falciani

  3. Arcetri Astrophysical Observatory, Largo Fermi 5, I 50125, Florence, Italy

    A. Donati-Falchi

Authors
  1. B. Caccin
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  2. R. Falciani
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  3. A. Donati-Falchi
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Caccin, B., Falciani, R. & Donati-Falchi, A. Temperature variations in the solar photosphere. Sol Phys 46, 29–52 (1976). https://doi.org/10.1007/BF00157553

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  • DOI: https://doi.org/10.1007/BF00157553

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