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Proceedings Paper

8446-Angstrom observations of neutral oxygen with the Spatial Heterodyne Spectrometer at Millstone Hill
Author(s): S. Watchorn; J. Noto; L. S. Waldrop
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Paper Abstract

Neutral oxygen (O I) is a dominant species between about 250 and 500 km in the thermosphere. A complete thermospheric model requires measurements of the species density ([O]) to incorporate into forward models. One way to measure [O] is to detect Bowen fluorescence at triplet 8446 Å. Bowen fluorescence is generated when thermospheric oxygen absorbs Solar Lyman-β and de-excites through a path eventually leading to 8446 emission. This emission must be distinguished from the brighter 8446 emission caused by photoelectron (PE) impact, which can be done by measuring the intensity ratio between two branches of the 8446 triplet. An instrument to measure Mid-latitude Bowen fluorescence has been installed at Millstone Hill Observatory. The instrument is a Spatial Heterodyne Spectrometer (SHS), a novel type of Fourier transform spectrometer. This SHS was first used to observe Na Fraunhofer lines from dayglow at 589 nm, and then observed the 8446 region in an oxygen spectrum tube. Modifications to the system will allow it to observe 8446 emissions from the evening sky.

Paper Details

Date Published: 23 September 2009
PDF: 10 pages
Proc. SPIE 7438, Solar Physics and Space Weather Instrumentation III, 74380D (23 September 2009); doi: 10.1117/12.825353
Show Author Affiliations
S. Watchorn, Scientific Solutions, Inc. (United States)
J. Noto, Scientific Solutions, Inc. (United States)
L. S. Waldrop, Univ. of Illinois at Urbana-Champaign (United States)


Published in SPIE Proceedings Vol. 7438:
Solar Physics and Space Weather Instrumentation III
Silvano Fineschi; Judy A. Fennelly, Editor(s)

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