The height dependence of quiet-sun photospheric temperature fluctuations in observations and simulations
Publication date
2006
Authors
Koza, J.
Kucera, A.
Rybák, J.
Wöhl, H.
Editors
Uitenbroek, Han
Leibacher, John
Stein, Robert F.
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Abstract
We derive rms temperature fluctuations as a function of height throughout the solar photosphere for the non-magnetic photosphere and a small area of enhanced magnetic activity, through semi-empirical inversion based on response functions of a 15-minute time sequence of 118″-long slit spectrograms taken at disk center. While the observed low photosphere shows small temperature fluctuations (about ≈ 50 K), the sub-photospheric layers and the upper photosphere show larger fluctuations, with similar gradients as in 3-D radiation-hydrodynamics simulations. However, the observed rms temperature fluctuations are lower than in the simulations at all depths, which we attribute to smearing by atmospheric seeing.
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Koza, J, Kucera, A, Rybák, J & Wöhl, H 2006, The height dependence of quiet-sun photospheric temperature fluctuations in observations and simulations. in H Uitenbroek, J Leibacher & R F Stein (eds), Solar MHD theory and observations : a high spatial resolution perspective : in honor of Robert F. Stein : proceedings of a meeting held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, USA, 18-22 July 2005. Astronomical Society of the Pacific conference series, no. 354, Astronomical Society of the Pacific, San Francisco, pp. 43-48.