Asymmetries and shifts of the solar K I 7699 A line and possible evidence for gravity waves in the quiet photosphere

Bibcode
1991A&A...244..492B
Bonet, J. A.; Marquez, I.; Vazquez, M.; Woehl, H.
Bibliographical reference

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 492-500. DGICYT-supported research.

Advertised on:
4
1991
Number of authors
4
IAC number of authors
3
Citations
18
Refereed citations
15
Description
A computing code has been developed to simulate the center-to-limb variation (CLV) of the bisector's shape, and absolute wavelength shift of the core in strong photospheric lines. Observational results concerning these aspects are also reported for the K I 7699 line. In the numerical simulation, granulation is represented, as a first approximation, by means of the granular model by Nelson (1978). It appears that granulation alone does not reproduce the observations and thus some modification has to be implemented in the dynamical model employed. A good match to the observed CLV of the wavelength shift of the line core is achieved by adding two 8-min period gravity waves with horizontal wavelength of the granular scale, the only difference between them being the sign of their horizontal wavenumber. Changes in the phase difference between the oscillating parameters have a decisive influence on the result.
Type
Refereed
Solar granulation

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