| Summary: | 碩士 === 國立中央大學 === 太空科學研究所 === 92 === Radio occultation is a technique first used by astronomers for sounding planetary atmosphere. Because of the GPS(Global Position System)is flourishing in recent years, this radio occultation technique has been applied to obtain vertical profile of electron density in the ionosphere. Global Position System/Meteorology(GPS/MET) experiment, which use a satellite in low Earth orbit(LEO) to receives the GPS radio waves which propagate through the ionosphere. From the radio occultation signals received by a LEO satellite, there are two radio occultion inversion algorithems to obtain vertical electron density profile. Both of the two inversion algorithems utily the Abel integral transform, which assumes spherical symmetry of electron density. The first algorithem is used through the computation of bending angle. The secend algorithem is used through the computation of total electron content (TEC).In this article, we use the secend algorithem to derive the electron profile. Then we have a research on fof2 and hmf2 derived from GPS/MET radio occultion and the comparison with IRI (International Reference Ionosphere) Model.
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