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RADIO SCIENCE,
VOL. 44,
RS5002,
10 PP., 2009
doi:10.1029/2009RS004154
A near real-time phenomenological model of ionospheric electron density based on GPS radio occultation data
Center for Space and Remote Sensing Research, National Central University, Chung-Li, Taiwan
Institute of Space Science, National Central University, Chung-Li, Taiwan
Institute of Space Science, National Central University, Chung-Li, Taiwan
Academia Sinica, Taipei, Taiwan
Department of Information Technology, Hsing Wu College, Lin-Kou, Taiwan
Institute of Space Science, National Central University, Chung-Li, Taiwan
A numerical and phenomenological model of global ionospheric electron density (N e ) is investigated. The three-dimensional N e model has been named the Taiwan Ionospheric Model (TWIM) and constructed from monthly weighted and hourly vertical N e profiles retrieved from FormoSat3/COSMIC GPS radio occultation measurements. The TWIM exhibits vertically fitted Chapman layers, with distinct F2, F1, E, and D layers, and surface spherical harmonics approaches for the fitted Chapman layer parameters including peak density, peak density height, and scale height. These results are useful in investigation of near-Earth space and large-scale N e distribution with diurnal and seasonal variations, along with geographic features such as the equatorial anomaly (EA). This paper also investigates the diurnal and seasonal variations of EA within different ionospheric layers and specifically attempts to account for the latitudinal and longitudinal structures caused by atmospheric tides.
Received 9 February 2009; accepted 19 June 2009; published 9 September 2009.
Citation: (2009), A near real-time phenomenological model of ionospheric electron density based on GPS radio occultation data, Radio Sci., 44, RS5002, doi:10.1029/2009RS004154.
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