Accession Number:

ADA633261

Title:

A First-principles Model of Spectrally Resolved 5.3 micrometers Nitric Oxide Emission from Aurorally Dosed Nighttime High-altitude Terrestrial Thermosphere

Descriptive Note:

Journal article

Corporate Author:

AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE

Personal Author(s):

Report Date:

2005-09-13

Pagination or Media Count:

5.0

Abstract:

The spectrally resolved nighttime 5.3 mm emission from NO observed by the Cryogenic Infrared Radiance Instrumentation for Shuttle CIRRIS-1A experiment aboard space shuttle Discovery at 195 km tangent altitude during a strong auroral event is modeled using a first principles kinetics model. An appropriate SHARC Strategic High Altitude Radiance Code Atmospheric Generator SAG is dosed with an IBC class III aurora. The spectrally resolved fundamental vibration-rotation band emissions from NO around 5.3 mm resulting from impacts of ambient NO with O as well as reactions of N atoms with O2 are calculated under steady state conditions. The calculated results, using a local translational temperature derived from the observed spectrum, are in excellent agreement with the CIRRIS-1A observations, validating our model. The importance of the accurate nascent vibrational and rotational distribution of chemically produced NO as well as the collisonally induced rotation-to- vibration relaxation of rotationally hot NO is pointed out.

Subject Categories:

  • Atmospheric Physics
  • Inorganic Chemistry
  • Physical Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE