First 844.6-nm observations of neutral oxygen using the Bowen fluorescence Spatial Heterodyne Spectrometer at Millstone Hill Observatory

Details First 844.6-nm observations of neutral oxygen using the Bowen fluorescence Spatial Heterodyne Spectrometer at Millstone Hill Observatory First 844.6-nm observations of neutral oxygen using the Bowen fluorescence Spatial Heterodyne Spectrometer at Millstone Hill Observatory

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0271w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0271

Other

0310 Airglow And Aurora, 0355 Thermosphere: Composition And Chemistry, 3360 Remote Sensing

Scientific paper

A Spatial Heterodyne Spectrometer (SHS) has been installed at Millstone Hill Observatory to detect mid-latitude 844.6-nm emissions from nightglow due to Bowen fluorescence, as a way of measuring thermospheric neutral oxygen density. Neutral oxygen is a dominant species in the F-region of the thermosphere, and new measurements of its density are needed to make more accurate models of that region, models which better describe responses to impulsive events such as storms and coronal mass ejections. The SHS will take readings with a time resolution of 12 minutes. It has been aligned an calibrated at 589 nm in association with a concurrent project at Scientific Solutions to perform Fraunhofer Line Discrimination spectroscopy at the sodium doublet wavelength. The SHS will presently be reset to look at 844.6 nm, which involves only a rotation of the SHS gratings to a new Littrow angle. The challenge of the mesaurement will be to separate the Bowen fluorescence 844.6-nm light from 844.6 light from other sources, most prominently photoelectron (PE) impact. It is expected that there will be characteristics of Bowen fluorescence 844.6 emissions which allow it to be distinguished from PE and other sources of 844.6. The most promising of these hallmarks is a specific intensity ratio theorized to exist between two of the three lines in the 844.6 triplet for Bowen fluorescence. It is also expected that Bowen fluorescence emissions at Millstone Hill will become more significant later at night, as the sun sets in the opposite hemisphere. First light 844.6 results and analysis will be presented.

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