Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa52a11f&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SA52A-11
Physics
0310 Airglow And Aurora, 0355 Thermosphere--Composition And Chemistry, 7549 Ultraviolet Emissions
Scientific paper
The High Resolution Airglow and Aurora Spectroscopy (HIRAAS) experiment was successfully launched on the USAF Advanced Research and Global Observation Satellite (ARGOS) and has monitored the thermospheric and ionospheric airglow since May 1999 using three ultraviolet spectrographs. Over 240 Gigabytes of science measurements from the HIRAAS experiment have been accumulated to this date. The High-resolution Ionospheric and Thermospheric Spectrograph (HITS) is a far- and extreme-ultraviolet (FUV/EUV) Rowland circle spectrograph sensing the 500-1500 Å passband with 0.5-Å spectral resolution. The Low Resolution Airglow and Auroral Spectrograph (LORAAS) instrument measures the EUV and FUV over the 800-1700 Å passband with 18-Å spectral resolution. Thermospheric temperature can be inferred from the rotational temperature of N2 in far-ultraviolet Lyman-Birge-Hopfied (LBH) emission when the band shapes are measured with sufficient spectral resolution. Dayside observations of molecular nitrogen LBH bands have been acquired by both HITS and LORAAS. Additionally, the HITS spectrograph periodically operates in stare mode at 200km and 120km tangent altitudes in the 1440-1560 Å passband. Techniques have been developed for retrieving termperature from the LBH (1-1) band in this passband. Using data mining and visualization techniques we compare the temperature distribution derived from the LBH emission observed by HITS and LORAAS over the time coverage of June 2000 and global coverage of the low and mid latitudes. The results will be discussed with respect to excitation mechanisms, geolocation, and geomagnetic activity effects.
Budzien Scott A.
Dymond Ken F.
Fortna Clyde B.
McCoy Robert P.
Nicholas Andrew C.
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