On the fluctuation of wing strengths as diagnostics of the solar atmosphere

Details On the fluctuation of wing strengths as diagnostics of the solar atmosphere On the fluctuation of wing strengths as diagnostics of the solar atmosphere

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...286..309k&link_type=abstract

Astronomy and Astrophysics 286, 309-313 (1994)

Astronomy and Astrophysics

Astrophysics

7

Sun: Granulation, Sun: Photosphere, Lines: Profiles

Scientific paper

We investigate the feasibility to obtain information on pressure fluctuations in the solar atmosphere from the collisionally dominated damping wings of strong Fraunhofer lines. One expects that the depression in the wings of lines from neutral atoms of predominantly ionised species, as Na, Fe, Mg, is proportional to the pressure. Thus we measured the fluctuations of continuum intensity and wing strength of Na D_2_ and Mg b_2_ from high spatial resolution observations obtained with the Gregory Coude Telescope at the Observatorio del Teide/Tenerife. Strong fluctuations of the wing strengths are indeed seen on granular scales. They are uncorrelated with the continuum brightness. Modelling of atmospheric temperature and pressure fluctuations, including response functions for intensity and wing strength, shows that temperature fluctuations have larger effects, by factors 5-6, than pressure perturbations upon both continuum brightness and wing strength. With precise measurements of temperature fluctuations and analysing the wing strengths of several lines which differ in their pressure dependence the detection of pressure fluctuations will become possible.

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