Mathematics – Logic
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsa31a..08s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SA31A-08
Mathematics
Logic
2415 Equatorial Ionosphere, 2722 Forecasting (7924, 7964)
Scientific paper
The Ionospheric Occultation Experiment (IOX) made GPS occultation measurements of the Earth's ionosphere during three years of operation between November 2001 and October 2004. IOX was in a 67° inclination, 800 km altitude orbit that precessed 180° every ~50 days, enabling observation of ionospheric characteristics as a function of both season and local time. The IOX measurements of GPS L1 and L2 carrier phase are used together with the Abel transform to determine vertical profiles of electron density from which F- region peak parameters are determined. A full year of observations beginning near the start of the mission (i.e., near-solar maximum conditions) are statistically binned and compared with a climatological model. To account for potential errors in interpretation that could arise from violation of the Abel transform assertion of spherical symmetry, the data are compared to both the climatology and to a 'limb viewing' version of the climatology generated through simulated ionospheric inversions with the model. Many general characteristics of the climatology are reproduced by the occultation data. However, several significant discrepancies between the model and the data are observed during this near-solar maximum time period. In particular, for some seasons average mid-latitude daytime densities are shown to be higher than the climatological prediction and the height of F2 layer in the post-sunset equatorial region is underestimated by up to 150 km.
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