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Infrared heterodyne spectroscopy: a tool for helioseismology

Published online by Cambridge University Press:  03 August 2017

D.A. Glenar ,
H.U. Käufl ,
D. Deming ,
T. Kostiuk  and
M.J. Mumma
D.A. Glenar
Affiliation:
Colgate University Physics Department Hamilton, NY 13346
H.U. Käufl
Affiliation:
NASA Goddard Space Flight Center Planetary Systems Branch Greenbelt, MD 20771
D. Deming
Affiliation:
NASA Goddard Space Flight Center Planetary Systems Branch Greenbelt, MD 20771
T. Kostiuk
Affiliation:
NASA Goddard Space Flight Center Planetary Systems Branch Greenbelt, MD 20771
M.J. Mumma
Affiliation:
NASA Goddard Space Flight Center Planetary Systems Branch Greenbelt, MD 20771

Abstract

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Heterodyne spectroscopy at infrared (IR) wavelengths is a technique well suited for measuring small velocities in the solar atmosphere. An IR heterodyne spectrometer for solar oscillation measurements has been located at the McMath Solar Telescope of the Kitt Peak National Solar Observatory. It is now being used for single point Doppler shift measurements of 11 micron OH absorption features formed in the upper photosphere, with sampling rates as high as 33 mHz. The instrument employs a stabilized CO2. laser permitting absolute velocity measurements with an uncertainty of < 10 ms−1.

Type
Chapter 8: Techniques for Observing Solar Oscillations
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 481 - 484
Copyright
Copyright © Reidel 1988 

References

1. See, for example, Kostiuk, T. and Mumma, M.J., ‘Remote Sensing by IR Heterodyne Spectroscopy’, Appl. Appt. 22, 2644, 1983.Google Scholar
2. Deming, D., Hillman, J.J., Kostiuk, T. and Mumma, M.J., ‘Thermal Bifurcation in the Upper Photosphere Inferred from Heterodyne Spectroscopy of OH Rotational Lines’, Solar Physics, 94, 1984.Google Scholar
3. Glenar, D.A., Deming, D., Espenak, F., Kostiuk, T. and Mumma, M.J., ‘Laser Heterodyne Spectrometer for Helioseismology’, Appl. Opt. 25, 58, 1986.Google Scholar
4. See, D. Deming, Glenar, D.A., Käufl, H.U. and Espenak, F., ‘Infrared Helioseismology: Detection of the Chromospheric Mode’, these proceedings.Google Scholar