Mathematics – Logic
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7159h&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7159
Mathematics
Logic
Scientific paper
In February of 1999, the US Air Force Space Test Program launched the Advanced Research and Global Observations Satellite (ARGOS) into an 830 km altitude, near-polar sun-synchronous orbit with a 14:30 ascending node local time. Aboard the ARGOS satellite is a suite of remote-sensing instruments that measure density, composition, and temperature of the thermosphere and ionosphere. The Low Resolution Airglow and Auroral Spectrograph (LORAAS) monitors upper atmospheric airglow in the far-ultraviolet and extreme-ultraviolet passband. LORAAS is identical to the Special Sensor Ultraviolet Limb Imager (SSULI) sensor whose mission will be starting with the launch of the next Defense Meteorological Satellite Program (DMSP) satellite and continuing on the next four DMSP satellites. Limb scans, atmospheric radiance profiles, in the satellite's orbital plane are collected every ninety seconds. Due to the expected decrease as a function of time in the sensitivity of the instrument, high voltage increases have been performed throughout the mission to increase the gain on the microchannel plates. The main objective of this study focuses on the need to observe the threshold at which LORAAS is no longer able to observe nightside mid-latitude electron densities. It is necessary to compute the changing sensitivity of LORAAS by making an identification of stars as they pass through the field of view of the instrument and measuring the instrument response as a function of time. The establishment of a sensitivity curve for the lifetime of the mission is useful knowledge both to the UV inversion and to characterize the behavior of the SSULI instrument.
Budzien Scott
Dymond Kenneth
Henderlight E. E.
McCoy R.
McDonald Steve
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