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Laser heterodyne spectrometer for helioseismology (1986)

Glenar, D. A. ; Mumma, M. J. ; Espenak, F. ; [et al.]

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Publication Date: 2011-08-19

Description: The technique of laser heterodyne spectroscopy has been applied to the measurement of solar oscillations. Coherent mixing of solar radiation with the output of a frequency-stabilized CO2 laser permits the measurement of fully resolved profiles of solar absorption lines with high spectral purity and excellent frequency stability. This technique has been used to measure OH pure rotation lines in the infrared solar spectrum. Power spectra of these line frequency measurements show the well-known 5-min oscillations as well as significant velocity power at shorter periods.

Keywords: INSTRUMENTATION AND PHOTOGRAPHY

Type: Applied Optics (ISSN 0003-6935); 25; 58-62

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