Physics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11.1003s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 11, Oct. 1984, p. 1003-1006. Research supported by the National Research Cou
Physics
17
Auroral Spectroscopy, Doppler Effect, Imaging Techniques, Optical Measurement, Emission Spectra, Michelson Interferometers, Optical Paths, Visible Spectrum
Scientific paper
The Fabry-Perot spectrometer method of measuring upper atmospheric winds and temperatures has now been firmly established. The Michelson interferometer offers an alternative approach that has so far received little attention. A brief description is given of a stable achromatic field-widened Michelson interferometer, that uses a CCD detector. Four phase-stepped images are reduced to images of phase (leading to velocity), of fringe visibility (leading to temperature), and intensity. Preliminary results on the 557.7 nm emission in aurora, made during field trials in February, 1984 are presented. During an auroral brightening three scale sizes of event were observed in the velocity images: a 'pulsation' filling the whole field of view and having a period of 200 s, a linear structure with an apparent wavelength of about 50 km, and a linear wavelike structure with an apparent wavelength of 10 km.
Anger Clifford D.
Cogger Leroy L.
Gault William A.
Haslett J. W.
Koehler R. A.
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