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The Infrared Granulation: Observations

Published online by Cambridge University Press:  03 August 2017

Serge Koutchmy
Serge Koutchmy*
Affiliation:
Institut d'Astrophysique, CNRS, 98 bis, Boulevard Arago, F-75014 Paris, France National Solar Observatory, Sunspot, NM 88349, U.S.A.

Abstract

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High spatial resolution observations of the solar granulation up to 3 μm are possible on existing vacuum solar telescopes. They permit the analysis of the deepest photospheric layers near 1.7 μm. A high photometric accuracy is achieved using scanning techniques with a pinhole photometer; imaging methods are used for 2D-analysis. Statistically significant results on granulation, including power spectrum and histogram analysis, center-limb variations and lifetime analysis, are presented. Temperature fluctuations of periods near 5 minute are considered at 1.7 μm, as well as large-scale variations at the scale of the meso- and, especially, the super-granulation. We also discuss the “abnormal” granulation in magnetic regions and the umbral granulation in the cores of sunspots.

Keywords

infrared: starsSun: granulationSun: photospheresunspots
Type
Part 3: Infrared Perspectives on Atmospheric Dynamics
Information
Symposium - International Astronomical Union , Volume 154: Infrared Solar Physics , 1994 , pp. 239 - 250
Copyright
Copyright © Kluwer 1994 

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