8446-Angstrom observations of neutral oxygen with the spatial heterodyne spectrometer at millstone hill

S. Watchorn, J. Noto, Lara Waldrop

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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. 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.

Original languageEnglish (US)
Title of host publicationSolar Physics and Space Weather Instrumentation III
DOIs
StatePublished - Nov 20 2009
EventSolar Physics and Space Weather Instrumentation III - San Diego, CA, United States
Duration: Aug 4 2009Aug 6 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7438
ISSN (Print)0277-786X

Other

OtherSolar Physics and Space Weather Instrumentation III
CountryUnited States
CitySan Diego, CA
Period8/4/098/6/09

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Watchorn, S., Noto, J., & Waldrop, L. (2009). 8446-Angstrom observations of neutral oxygen with the spatial heterodyne spectrometer at millstone hill. In Solar Physics and Space Weather Instrumentation III [74380D] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 7438). https://doi.org/10.1117/12.825353