Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0384n&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0384
Mathematics
Logic
0355 Thermosphere: Composition And Chemistry, 0394 Instruments And Techniques, 7853 Spacecraft/Atmosphere Interactions
Scientific paper
Determination of neutral density in the thermosphere is of general scientific interest for many reasons: comparison to existing first principal and climatological models, inputs to assimilating models, and various applications that require density specifications such as orbit determination. Several techniques to obtain the density of the atmosphere are in various stages of research and development at the Naval Research Laboratory. This study will examine and compare the results of two of these techniques, satellite drag derived densities and Ultraviolet airglow derived densities. The Special Sensor Ultraviolet Limb Imager (SSULI) is a limb-scanning spectrograph developed by the Naval Research Laboratory (NRL) for the Air Force Defense Meteorological Satellite Program (DMSP). A prototype of the SSULI sensor, the Low-Resolution Airglow and Auroral Spectrograph (LORAAS) on the Advanced Research and Global Observation Satellite (ARGOS), acquired data from May 1999 to April 2002. The LORAAS and SSULI sensors measure vertical profiles of the Earth's natural airglow radiation in the extreme ultraviolet (EUV) and far ultraviolet (FUV) regions of the spectrum. A chi-squared minimization technique from Discrete Inverse Theory (DIT) is used to retrieve neutral density profiles from the spectral data. The NRLMSISE-00 atmospheric model is used as the forward model for the DIT process. The output consists of an effective F10.7 cm solar flux, an effective 81-day average F10.7 cm solar flux, neutral density scalars for the three major neutral constituents O, O2 and N2. The satellite drag densities were derived from Space Surveillance Network (SSN) data using the special perturbations software suite (Special-K) developed at the Naval Research Laboratory. For this study, several satellites were selected based on orbital parameters and stability of their ballistic coefficients. The density profiles retrieved from the LORAAS data are compared to densities derived from satellite drag data obtained during the January 2001 through February 2001 time period. Results provide a validation of the UV spectral inversion technique for thermospheric density determination.
Budzien Scott A.
Dymond Ken F.
Henderlight E. E.
Knowles Stephen H.
McCoy Robert P.
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