Fall 2008 Observations of neutral oxygen emissions at 844.6 nm using the Millstone Hill Spatial Heterodyne Spectrometer

Details Fall 2008 Observations of neutral oxygen emissions at 844.6 nm using the Millstone Hill Spatial Heterodyne Spectrometer Fall 2008 Observations of neutral oxygen emissions at 844.6 nm using the Millstone Hill Spatial Heterodyne Spectrometer

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsa21b1563w&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SA21B-1563

Physics

0340 Middle Atmosphere: Composition And Chemistry, 0355 Thermosphere: Composition And Chemistry, 0394 Instruments And Techniques

Scientific paper

In Fall 2008, after extensive realignment and insertion of new optical components, the Millstone Hill Spatial Heterodyne Spectrometer made twilight (pre-sunrise and post-sunset) observations of 844.6 nm emissions from atmospheric neutral oxygen from the F-region. Analysis of the resulting spectrum for absolute brightness and temperature will be used to feed a new forward model of the mesopshere and lower thermospheric (MLT) region, extracting new results for the density of neutral oxygen in that region, following the techniques described by Drs. Redgie Lancaster and Lara Waldrop. Improvements in the Spatial Heterodyne Spectrometer for these measurements include the insertion of new, nearly pristine reflection diffraction gratings; a reset of the "zero path" of the instrument to try to improve fringe contrast; and the elimination of noise in the detected images equal to, and even at times slightly greater than, the expected signal. All of these issues will be discussed, along with the challenge of seeing the 8446 line emission over the twilight continuum during observations.

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