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Near IR Observations of the 11 July 1991 Total Solar Eclipse from Mauna Kea, Hawaii

Published online by Cambridge University Press:  03 August 2017

T. A. Clark ,
D. A. Naylor ,
G. J. Tompkins  and
C. Lindsey
T. A. Clark
Affiliation:
Physics Department, University of Calgary, Calgary, Alberta T2N 1N4, Canada
D. A. Naylor
Affiliation:
Department of Physics, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
G. J. Tompkins
Affiliation:
Department of Physics, University of Lethbridge, Lethbridge, Alberta T1K 3M4, Canada
C. Lindsey
Affiliation:
Solar Physics Research Corporation, 4720 Calle Desecada, Tucson, AZ 85718, U.S.A.

Abstract

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Near IR total eclipse measurements have provided clear evidence during both 2nd and 3rd contacts for a limb extension of about 125 km for wavelengths in the range containing the CO fundamental vibration-rotation bands between 4.3 and 5.5 μm, when compared to the limb at nearby shorter wavelengths. This is interpreted as a “flash” spectrum in the CO lines, with the above extension representing the outer level of the CO emission layer. This height can be compared to the τCO = 1.0 level incorporated into recent representative atmospheric models (Ayres and Wiedemann, 1989) which is 90 km above the visible limb for a semi-empirical “hot chromosphere” model (Avrett, 1985) and 220 km for a “cool” radiative equilibrium model based upon work by Anderson (1989).

Keywords

CO moleculeeclipsesinfrared: starsSun: chromosphere
Type
Part 2: Infrared Observations of the 1991 Total Solar Eclipse
Information
Symposium - International Astronomical Union , Volume 154: Infrared Solar Physics , 1994 , pp. 173 - 178
Copyright
Copyright © Kluwer 1994 

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