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Temperature stratification in the Sun's photosphere in high horizontal resolution using Ca II H filtergrams.
Stockholm University, Faculty of Science, Department of Astronomy. (KVAs inst. f. solfysik)
(KVAs inst. f. solfysik)
2009 (English)In: Memorie della Societa Astronomica Italiana, Vol. 80, 639- p.Article in journal (Other academic) Published
Abstract [en]

A method to extract the temperature stratification in the Sun's photosphere using filtergrams is presented along with some high resolution results. The data was acquired with the Swedish 1-m Solar Telescope (SST) using a tunable filter in the Ca II H blue wing. Each full scan is completed in the order of seconds thus allowing for the full resolution of the SST and reasonable depth sampling to be obtained simultaneously in a shorter time than that of the evolution time scale of the photosphere. We test the quality of the method by applying it to a set of synthetic images (obtained through radiative transfer on 3D HD and MHD simulation snapshots followed by degradation) and comparing the output with the known 3D simulated atmosphere. Fine structure around bright points becomes evident in both the temperature gradient maps computed from a set of test observations and synthetic images obtained from MHD simulations.

Place, publisher, year, edition, pages
2009. Vol. 80, 639- p.
Keyword [en]
Sun: High Resolution, Sun: Temperature Stratification
URN: urn:nbn:se:su:diva-35016OAI: diva2:286137
Available from: 2010-01-13 Created: 2010-01-13 Last updated: 2011-02-15Bibliographically approved

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Henriques, V. M. J.Kiselman, D.
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