Radio plasma imager simulations and measurements |
| |
| Authors: | Green JL Benson RF Fung SF Taylor WWL Boardsen SA Reinisch BW Haines DM Bibl K Cheney G Galkin IA Huang X Myers SH Sales GS Bougeret J-L Manning R Meyer-Vernet N Moncuquet M Carpenter DL Gallagher DL Reiff PH |
| |
| Institution: | (1) NASA Goddard Space Flight Center, U.S.A.;(2) Raytheon Corporation, NASA Goddard Space Flight Center, Greenbelt, MD, U.S.A.;(3) Center for Atmospheric Research, University of Massachusetts, Lowell, MA, U.S.A.;(4) Observatoire de Paris, Meudon, France;(5) Stanford University, Stanford, CA, U.S.A.;(6) NASA Marshall Space Flight Center, Huntsville, AL, U.S.A.;(7) Rice University, Houston, TX, U.S.A |
| |
| Abstract: | The Radio Plasma Imager (RPI) will be the first-of-its kind instrument designed to use radio wave sounding techniques to perform repetitive remote sensing measurements of electron number density (N
e) structures and the dynamics of the magnetosphere and plasmasphere. RPI will fly on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) mission to be launched early in the year 2000. The design of the RPI is based on recent advances in radio transmitter and receiver design and modern digital processing techniques perfected for ground-based ionospheric sounding over the last two decades. Free-space electromagnetic waves transmitted by the RPI located in the low-density magnetospheric cavity will be reflected at distant plasma cutoffs. The location and characteristics of the plasma at those remote reflection points can then be derived from measurements of the echo amplitude, phase, delay time, frequency, polarization, Doppler shift, and echo direction. The 500 m tip-to-tip X and Y (spin plane) antennas and 20 m Z axis antenna on RPI will be used to measures echoes coming from distances of several R
E. RPI will operate at frequencies between 3 kHz to 3 MHz and will provide quantitative N
e values from 10–1 to 105 cm–3. Ray tracing calculations, combined with specific radio imager instrument characteristics, enables simulations of RPI measurements. These simulations have been performed throughout an IMAGE orbit and under different model magnetospheric conditions. They dramatically show that radio sounding can be used quite successfully to measure a wealth of magnetospheric phenomena such as magnetopause boundary motions and plasmapause dynamics. The radio imaging technique will provide a truly exciting opportunity to study global magnetospheric dynamics in a way that was never before possible. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
