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Observations of Seeing at 0.5 and 12.4 μm

Published online by Cambridge University Press:  19 July 2016

W. Livingston ,
G. Kopp ,
D. Gezari  and
F. Varosi
W. Livingston
Affiliation:
National Solar Observatory, PO Box 26732, Tucson, AZ 85726, USA
G. Kopp
Affiliation:
National Solar Observatory, PO Box 26732, Tucson, AZ 85726, USA
D. Gezari
Affiliation:
NASA/GSFC, Infrared Astrophysics Branch, Greenbelt, MD 20771, USA
F. Varosi
Affiliation:
NASA/GSFC, Infrared Astrophysics Branch, Greenbelt, MD 20771, USA

Abstract

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A variety of observations have been made of solar features (sunspots, faculae, the limb) using both array and single element scanning techniques. The telescope was the 1.6 m McMath-Pierce on Kitt Peak. Array data were acquired with a 58×62 pixel Si:Ga detector at 4.8, 7.8, 12.4, and 18 μm, while a CCD camera recorded the same image position at 0.5 μm. In a separate experiment, a nutating mirror device was used to generate a raster scan of solar disk areas, the output being fed to a Si PIN diode (0.5 μm filter) and a As:Si diode (12.4 μm filter). The scanner data yield simultaneous images at the two wavelengths and was essentially a repeat of the 1970 Turon-Léna experiment with updated equipment. Examples of images at the various wavelengths are given in the poster. Analysis of the data is incomplete at this time. We can report that the effects of seeing were encountered at all wavelengths, including 18μm, even though conditions were deemed good at times (for example, penumbral filaments were resolved in sunspots). We have thus been unable to verify, as yet, the conditions reported by Bester et al, in which exceptional seeing is realized in the infrared.

Keywords

SeeingInfraredSolar
Type
Adaptive Optics and Seeing
Information
Symposium - International Astronomical Union , Volume 158: Very High Angular Resolution Imaging , 1994 , pp. 299 - 301
Copyright
Copyright © Kluwer 1994 

References

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