Physics – Plasma Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51b0519w&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM51B-0519
Physics
Plasma Physics
2447 Modeling And Forecasting, 2494 Instruments And Techniques, 3260 Inverse Theory, 3337 Numerical Modeling And Data Assimilation, 4275 Remote Sensing And Electromagnetic Processes (0689)
Scientific paper
By the available evidence we are in the midst of a revolution in ionospheric remote sensing touched off by the illuminating powers of the Global Positioning System (GPS) and the advent of data assimilation techniques for space weather. Hundreds of globally distributed ground GPS stations provide over half a million total electron content (TEC-integrated electron density along the receiver-satellite line-of-sight) measurements daily. Furthermore, several existing low-Earth orbit satellites, such as CHAMP, SAC/C and IOX, are equipped with GPS receivers which collect hundreds of globally distributed GPS occultations daily, offering very high vertical resolution (1km) profiles of electron density from the D-region to the topside ionosphere. In about 3-4 years, as several missions featuring GPS occultations are launched, the number of daily GPS occultations will reach several thousands. This global and continuous coverage of the ionosphere is unprecedented and the optimal means of extracting its information content is through data assimilation techniques similar to those used in atmospheric numerical weather prediction. Our presentation will summarize the effort at the University of Southern California and the Jet Propulsion Laboratory for the implementation and evaluation of a global assimilative ionospheric model (GAIM). GAIM is a physics-based 3D Kalman-filter approach capable of ingesting ground and flight GPS TEC, in addition to UV irradiance and in-situ electron density measurements. By incorporating such disparate datasets, GAIM produces a snapshot of the 3D ionosphere every 12 minutes for use in space weather monitoring, prediction and basic plasma physics research. Our presentation will show results of daily GAIM runs performed over the past 9 months and its validation against independent measurements from Topex altimetry, ionosondes, in-situ electron density, and incoherent scatter radars. Furthermore, our presentation will assess the crucial impact of space data for accurate electron density profiling.
Hajj George A.
Mandrake Lukas
Pi Xiaoqing
Wang Chenjie
Wilson David B.
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