Validation of Nighttime LORAAS Instrument Measurements of the 1356-Å Emission

Details Validation of Nighttime LORAAS Instrument Measurements of the 1356-Å Emission Validation of Nighttime LORAAS Instrument Measurements of the 1356-Å Emission

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa21a..05b&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA21A-05

Mathematics

Logic

2400 Ionosphere, 2419 Ion Chemistry And Composition (0335)

Scientific paper

This study will focus on electron density profiles derived by inversion of ultraviolet limb scans observed over a period of several months by the Low Resolution Airglow and Aurora Spectrograph (LORAAS) instrument on the Advanced Research and Global Observing Satellite (ARGOS). The O+ density profile, which is approximately equal to the electron density profile in the F-region ionosphere, was determined by inverting the limb radiance profile of O I 1356 Å emission of atomic oxygen. This emission is produced purely by radiative recombination of O+ ions and electrons at night and has been shown to be a viable means of globally sensing the ionospheric state. The results of this study will be valuable for the Special Sensor Ultraviolet Limb Imager (SSULI) instruments flying on the satellites of the Defense Meteorological Satellite Program (DMSP). The first DMSP satellite to carry a SSULI was launched in October 2003, with more launches planned. The SSULI instruments are similar to the LORAAS instrument, which served as the SSULI prototype. Dymond et al. [Geophys. Res. Lett., Vol. 28, No. 5, 927-930, 2001] showed a preliminary validation of this technique covering a single day of observations. We will show a more extended validation of the retrieved peak electron density determined by a one-dimensional inversion of nighttime observations of the 1356-Å altitude profiles with nearly coincident ionosonde measurements.

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