30 December 2004 GPS-based remote sensing of the geospace environment: horizontal and vertical structure of the ionosphere and plasmasphere
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Transmissions of the Global Positioning System (GPS) satellites can be used to measure the total electron content (TEC) between a receiver and several GPS satellites in view. This simple observable is yielding a wealth of new scientific information about ionosphere and plasmasphere dynamics. Data available from thousands of ground-based GPS receivers are used to image the large-scale and mesoscale ionospheric response to geospace forcings at high-precision covering all local times and latitudes. Complementary measurements from space-borne GPS receivers in low-Earth orbit provide information on both vertical and horizontal structure of the ionosphere/plasmasphere system. New flight hardware designs are being developed that permit simultaneous measurement of integrated electron content along new raypath orientations, including zenith, cross-track and nadir antenna orientations (the latter via bistatic reflection of the GPS signal off ocean surfaces). We will discuss a new data assimilation model of ionosphere, the Global Assimilative Ionosphere Model (GAIM), capable of integrating measurements from GPS and other sensors with a physics-based ionospheric model, to provide detailed global nowcasts of ionospheric structure, useful for science and applications. Finally, we discuss efforts underway to combine GPS space-based observations of plasmaspheric TEC, with ground-based magnetometer measurements, and satellite-based images from NASA's IMAGE satellite, to produce new dynamic models of the plasmasphere.
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Anthony J. Mannucci, Anthony J. Mannucci, George A. Hajj, George A. Hajj, Byron A. Iijima, Byron A. Iijima, Attila Komjathy, Attila Komjathy, Thomas K. Meehan, Thomas K. Meehan, Xiao Qing Pi, Xiao Qing Pi, Jeff Srinivasan, Jeff Srinivasan, Bruce T. Tsurutani, Bruce T. Tsurutani, Brian Wilson, Brian Wilson, Liwei D. Zhang, Liwei D. Zhang, Mark Moldwin, Mark Moldwin, } "GPS-based remote sensing of the geospace environment: horizontal and vertical structure of the ionosphere and plasmasphere", Proc. SPIE 5660, Instruments, Science, and Methods for Geospace and Planetary Remote Sensing, (30 December 2004); doi: 10.1117/12.580048; https://doi.org/10.1117/12.580048

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