A Comparison of LORAAS and GUVI Observations of the Low-Latitude Ionosphere

Details A Comparison of LORAAS and GUVI Observations of the Low-Latitude Ionosphere A Comparison of LORAAS and GUVI Observations of the Low-Latitude Ionosphere

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsa41b..06m&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SA41B-06

Physics

0310 Airglow And Aurora, 2415 Equatorial Ionosphere, 2494 Instruments And Techniques

Scientific paper

The Low Resolution Airglow and Aurora Spectrograph (LORAAS) aboard the Advanced Research and Global Observation Satellite (ARGOS) collected numerous spectra of Earth's airglow in the extreme ultraviolet and far ultraviolet regimes (80 - 170 nm) from 1999-2002. From the limb scans made of the 135.6 nm ultraviolet emission, profiles of the nighttime (0230 LT) electron density in the ionosphere can be derived. The Global Ultraviolet Imager (GUVI) aboard NASA's Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) satellite scans a nadir-to-limb swath in five spectral channels, including 135.6 nm. In early March 2002, the paths of ARGOS and TIMED nearly coincided, providing an opportunity to compare the 135.6 nm observations of both LORAAS and GUVI in the low-latitude region at various longitudes. In this study, we compare the electron density profiles derived from the LORAAS and GUVI limb data. We vertically integrate the density profiles to obtain the total electron content (TEC) as a function of latitude and compare these results with TEC derived from GUVI images of the disk on the nightside as well as TEC obtained from the global network of GPS receivers. We further compare these observations to first principles ionospheric models.

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