LORAAS Observations of the Seasonal and Longitudinal Variations in the Equatorial Ionosphere

Details LORAAS Observations of the Seasonal and Longitudinal Variations in the Equatorial Ionosphere LORAAS Observations of the Seasonal and Longitudinal Variations in the Equatorial Ionosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0383m&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0383

Physics

0310 Airglow And Aurora, 2415 Equatorial Ionosphere, 2494 Instruments And Techniques, 7549 Ultraviolet Emissions

Scientific paper

The Low Resolution Airglow and Aurora Spectrograph (LORAAS) has collected numerous spectra of Earth's airglow in the extreme ultraviolet and far ultraviolet regimes (800 to 1700 Angstroms) during the mission life which began in May 1999 and ended in April 2002. Limb scans, atmospheric radiance profiles in the satellite's orbital plane, were collected every ninety seconds throughout the experiment's lifetime. The intensity of the nighttime O I 1356 Angstrom emissions associated with the equatorial anomaly were measured and interpreted using a quasi-tomographic technique to invert the intensity scans to derive electron density profiles of the ionosphere in the anomaly region at 0230 LT. In this study, reconstructed electron density profiles (EDPs) of several months of LORAAS data are used to determine the separation, peak heights and densities of the northern and southern anomaly crests at approximately 0230 LT. We observe that even under relatively quiet conditions there are significant day-to-day and longitudinal variations in the equatorial ionosphere. We investigate the longitudinal dependence of the 0230 LT ionosphere and seasonal control of this dependence. The results are compared to first principles ionospheric models.

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