Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsa32a..02f&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SA32A-02
Physics
0310 Airglow And Aurora, 0350 Pressure, Density, And Temperature, 0355 Thermosphere: Composition And Chemistry, 0394 Instruments And Techniques
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. Three years of second by second science measurements from the HIRAAS experiment have been accumulated to this date. The Low Resolution Airglow and Auroral Spectrograph (LORAAS) instrument measures the EUV and FUV spectrum over the 800-1700 Angstrom pass band with 18-Angstrom resolution. The field-of-view of the LORAAS is 0.1 x 2.4 degrees, which corresponds to 5 km vertical x 125 km horizontal. The field-of-view is swept across the Earth's limb using a rotating scan mirror. A full scan of the airglow emission are made over the 750 km to 50 km altitude range every 95 seconds. Molecular nitrogen (N2) is observed in the far-ultraviolet Lyman-Birge-Hopfied (LBH) emissions around 1430 Angstroms. Atomic Oxygen (O) is observed in the 1356 Angstrom emission. Each day the LORAAS instrument makes 14 orbits of the Earth consisting of 64 altitude scans each. Knowledge of the statistical variation of the observed emissions is an indication of the kinds of structure of the upper atmosphere. This knowledge determines scales required for a tomographic inversion of the data. Using a statistical survey of the data we show the daily variability of the N2 and O bands as a function of tangent point altitude and latitude compared to the expectation value of statistical variation. The results will be discussed with respect to MSIS model predictions, Dynamic Explorer measurements, and solar and geomagnetic activity.
Andrew N. C.
Budzien Scott A.
Dymond Ken F.
Fortna Clyde B.
McCoy Robert P.
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