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.
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References
Aikyo, K. and Ondoh, T.: 1971, ‘Propagation of Nonducted VLF Waves in the Vicinity of the Plasmapause’, J. Radio Res. Labs. 18, 153.
Anderson, P. C., Heelis, R. A. and Hanson, W. B.: 1991, ‘The Ionospheric Signatures of Rapid Subauroral Ion Drifts’, J. Geophys. Res. 96, 5785.
Anderson, P. C., Hanson, W. B., Heelis, R. A., Craven, J. D., Baker, D. N. and Frank, L. A.: 1993, ‘A Proposed Production Model of Rapid Subauroral Ion Drifts and Their Relationship to Substorm Evolution’, J. Geophys. Res. 98, 6069.
Angerami, J. J. and Thomas, J. O.: 1964, ‘The Distribution of Ions and Electrons in the Earth’s Exosphere’, J. Geophys. Res. 69, 4537.
Benson, R. F.: 1977, ‘Stimulated Plasma Waves in the Ionosphere’, Radio Sci. 12, 861–878.
Benson, R. F.: 1985, ‘Field-Aligned Electron Density Irregularities Near 500 km — Equator to Polar Cap Topside Sounder Z Mode Observations’, Radio Sci. 20, 477.
Benson, R. F.: 1993, ‘Elusive Upper Hybrid Waves in the Auroral Topside Ionosphere’, in R. L. Lysak (ed.), Auroral Plasma Dynamics, Geophysical Monograph 80, American Geophysical Union, Washington, D.C., pp. 267–274.
Benson, R. F.: 1997, ‘Evidence for the Stimulation of Field-Aligned Electron Density Irregularities on a Short Time Scale by Ionospheric Topside Sounders’, J. Atm. and Solar-Terr. Phys. 59, 2281.
Benson, R. F. and Akasofu, S.-I.: 1984, ‘Auroral Kilometric Radiation/Aurora Correlation’, Radio Sci. 19, 527.
Benson, R. F. and Calvert, W.: 1979, ‘ISIS 1 Observations at the Source of Auroral Kilometric Radiation’, Geophys. Res. Lett. 6, 479.
Benson, R. F. and Osherovich, V. A.: 1992, ‘High Order Stimulated Ionospheric Diffuse Plasma Resonances — Significance to Magnetospheric Emissions’, J. Geophys. Res. 97, 19,413.
Benson, R. F., Fainberg, J., Hess, R. A., Osherovich, V. A. and Stone, R. G.: 1997, ‘An Explanation for the Absence of Sounder-Stimulated Gyroharmonic Resonances in the Io Plasma Torus by the Ulysses Relaxation Sounder’, Radio Sci. 32, 1127.
Benson, R. F., Osherovich, V. A., Fainberg, J., MacDowall, R. J. and Stone, R. G.: 1998a, ‘Magnetospheric ‘(n + 1/2)’ Emissions Observed Both Above and Below the Electron Plasma Frequency’, Suppl. Eos Trans. AGU 79, F690.
Benson, R. F., Green, J. L., Fung, S. F., Reinisch, B. W., Calvert, W., Haines, D. M., Bougeret, J.-L., Manning, R., Carpenter, D. L., Gallagher, D. L., Reiff,, P. H. and Taylor, W. W. L.: 1998b, ‘Magnetospheric Radio Sounding in the 21st Century’, Radio Sci. Bull. 28, 9.
Birmingham, T. J., Alexander, J. K., Desch, M. D., Hubbard, R. F. and Pedersen, B. M.: 1981, ‘Observations of Electron Gyroharmonic Waves and the Structure of the Io Torus’, J. Geophys. Res. 86, 8497.
Breit, G. and Tuve, M. A.: 1926, ‘A Test for the Existence of the Conducting Layer’, Phys. Rev. 28, 554.
Calvert, W.: 1981, ‘The Detectability of Ducted Echoes in the Magnetosphere’, J. Geophys. Res. 86, 1609.
Calvert, W., Benson, R. F., Carpenter, D. L., Fung, S. F, Gallagher, D. L., Green, J. L., Haines, D. M., Reiff,, P. H., Reinisch, B. W., Smith, M. F. and Taylor, W. W. L.: 1995, ‘The Feasibility of Radio Sounding in the Magnetosphere’, Radio Sci. 30, 1577.
Carpenter, D. L.: 1970, ‘Whistler Evidence of the Dynamic Behavior of the Duskside Bulge in the Plasmasphere’, J. Geophys. Res. 75, 3837.
Carpenter, D. L. and Anderson, R. R.: 1992, ‘An ISEE/Whistler Model of Equatorial Electron Density in the Magnetosphere’, J. Geophys. Res. 97, 1097.
Carpenter, D. L. and Lemaire, J.: 1997, ‘Erosion and Recovery of the Plasmasphere in the Plasmapause Region’, Space Sci. Rev. 80, 153.
Carpenter, D. L. and Seely, N. T.: 1976, ‘Cross-L Plasma Drifts in the Outer Plasmasphere: Quiet Time Patterns and Some Substorm Effects’, J. Geophys. Res. 81, 2728.
Carpenter, D. L., Smith, A. J., Giles, B. L., Chappell, C. R. and Decreau, P. M. E.: 1992, ‘A Case Study of Plasma Structure in the Dusk Sector Associated with Enhanced Magnetospheric Convection’, J. Geophys. Res. 97, 1157.
Carpenter, D. L., Giles, B. L., Chappell, C. R., Decreau, P. M. E., Anderson, R. R., Persoon, A.M., Smith, A. J., Corcuff, Y. and Canu, P.: 1993, ‘Plasmasphere Dynamics in the Duskside Bulge Region: a New Look at an Old Topic’, J. Geophys. Res. 98, 19243.
Carpenter, D. L., Anderson, R. R., Calvert, W. and Moldwin, M. B.: 1999, ‘CRRES Observations of Density Cavities within the Plasmasphere’, J. Geophys. Res. (submitted).
Chappell, C. R., Harris, K. K. and Sharp, G. W.: 1971, ‘The Dayside of the Plasmasphere’, J. Geophys. Res. 76, 7632.
Chappell, C. R.: 1974, ‘Detached Plasma Regions in the Magnetosphere’, J. Geophys. Res. 79, 1861.
Christiansen, P., Gough, P., Martelli, G., Bloch, J.-J., Cornilleau, N., Etcheto, J., Gendrin, R., Jones, D., Beghin, C. and Decreau, P.: 1978, ‘Geos I: Identification of Natural Magnetospheric Emissions’, Nature 272, 682.
Crooker, N. U. and Burke, W. J.: 1991, ‘The Cusp/Cleft’, Rev. Geophys. Suppl. U.S. National Report to IUGG, 1017–1027.
Dyson, P. L. and Benson, R. F: 1978, ‘Topside Sounder Observations of Equatorial Bubbles’, Geophys. Res. Lett. 5, 795.
Elphic, R. C., Weiss, L. A., Thomsen, M. F and McComas, D. J.: 1997, ‘Evolution of Plasmaspheric Ions at Geosynchronous Orbit During Times of High Geomagnetic Activity’, Geophys. Res. Lett. 23, 2189.
Escoubet, C. P., Smith, M. F, Fung, S. F, Anderson, P. C., Hoffman, R. A., Basinska, E. M. and Bosqued, J. M.: 1992, ‘Staircase Ion Signature in the Polar Cusp: a Case Study’, Geophys. Res. Lett. 19, 1735.
Escoubet, C. P., Smith, M. F, Fung, S. F, Hoffman, R. A. and Bosqued, J. M.: 1995, ‘Electron Structures in the Cusp/Cleft RRegion Observed by DE 2 Satellite’, J. Geophys. Res. 100, 1597.
Etcheto, J., de Feraudy H. and Trotignon, J. G.: 1981, ‘Plasma Resonance Stimulation in Space Plasmas’, Adv. Space Res. 1, 183.
Fung, S. F and Green, J. L.: 1996, ‘Global Imaging and Radio Remote Sensing of the Magnetosphere, Radiation Belts: Models and Standards’, AGU Monograph 97, 285.
Fung, S. F., Benson, R. F., Carpenter, D. L., Reinisch, B. W. and Gallagher, D. L.: 2000, ‘Investigations of Irregularities in Remote Plasma Regions by Radio Sounding: Applications of the Radio Plasma Imager on IMAGE’, Space Sci. Rev. 91, 391–419 (this issue).
Fung, S. F., Eastman, T. E., Boardsen, S. A. and Chen, S.-H.: 1997, ‘High-Altitude Cusp Positions Sampled by the Hawkeye Satellite’, in Proc. First Alpén Conference on Low-Latitude Magnetospheric Processes, Physics and Chemistry of the Earth, Vol. 22, Pergamon Press, London, pp. 653–662.
Green, J. L.: 1988, ‘Ray Tracing of Planetary Radio Emissions’, in Planetary Radio Emissions II, Proceedings of the 2nd international workshop, Graz, Austria, pp. 355–379.
Green, J. L., Fung, S. F. and Burch, J. L.: 1996, ‘Application of Magnetospheric Imaging Techniques to Global Substorm Dynamics’, Proceedings of the 3rd International Conference on Substorms, Versailles, ESA SP-389, 655–661.
Green, J., Fung, S., Gallagher, D., Fok, M.-C., Wilson, G., Gladstone, G., Perez, J., Reiff, P., Burch, J. and Moore, T.: 1998a, ‘Global-Scale Imaging: New Approaches in Magnetospheric Research’, COSPAR Colloquia Series, Magnetospheric Research with Advanced Techniques, Vol. 9, Pergamon, London, pp. 41–50.
Green, J. L., Taylor, W. W. L., Fung, S. F., Benson, R. F., Calvert, W., Reinisch, B Gallagher, D. L. and Reiff, P.: 1998b, ‘Radio Remote Sensing of Magnetospheric Plasmas, Measurement Techniques for Space Plasmas: Fields’, AGU Monograph 103, 193.
Gurnett, D. A. and Shaw, R. R.: 1973, ‘Electromagnetic Radiation Trapped in the Magnetosphere Above the Plasma Frequency’, J. Geophys. Res. 78, 8136.
Haselgrove, J.: 1955, ‘Ray Theory and a New Method for Ray Tracing’, London Phys. Soc, Report of Conference on the Physics of the Ionosphere, p. 355.
Higel, B. and de Feraudy, H.: 1977, ‘Experimental and Theoretical First Approach to fH Plasma Resonance from a Relaxation Sounding Rocket Experiment’, Radio Sci. 12, 879.
Higel, B. and Wu, L.: 1984, ‘Electron Density and Plasmapause Characteristics at 6.6 RE. A Statistical Study of the GEOS 2 Relaxation Sounder Data’, J. Geophys. Res. 89, 1583.
Ho, D. and Carpenter, D. L.: 1976, ‘Outlying Plasmasphere Structure Detected by Whistlers’, Planet. Space Sci. 24, 987.
Home, R. B.: 1995, ‘Propagation to the Ground at High Latitudes of Auroral Radio Noise Below the Electron Gyrofrequency’, J. Geophys. Res. 100, 14637.
Horwitz, J. L., Comfort, R. H. and Chappell, C. R.: 1990, ‘A Statistical Characterization of Plasmasphere Density Structure and Boundary Locations’, J. Geophys. Res. 95, 7937.
Huang, X. and Reinisch, B. W.: 1982, ‘Automatic Calculation of Electron Density Profiles from Digital Ionograms 2. True Height Inversion of Topside Ionograms with the Profile-Fitting Method’, Radio Sci. 17, 837.
Issautier, K., Meyer-Vernet, N., Moncuquet, M. and Hoang, S.: 1999, ‘Quasi-Thermal Noise in a Drifting Plasma: Theory and Application to Solar Wind Diagnostic on Ulysses’ J. Geophys. Res. (in press).
Jackson, J. E.: 1969, ‘The Reduction of Topside Ionograms to Electron-Density Profiles’, Proc. IEEE 57, 960.
Jackson, J. E., Schmerling, E. R. and Whitteker, J. H.: 1980, ‘Mini-Review on Topside Sounding’, IEEE Trans. Antennas Propagat. AP-28, 284.
Jackson, J. E.: 1986, ‘Alouette-ISIS Program Summary’, NSSDC Report 86-09, National Space Science Data Center, Greenbelt, Maryland.
James, H. G.: 1979, ‘Wave Propagation Experiments at Medium Frequencies between Two Ionospheric Satellites 3. Z mode pulses’, J. Geophys. Res. 84, 499–506.
Kimura, I.: 1966, ‘Effects of Ions on Whistler Mode Ray Tracing’, Radio Science I (New Series) 3, 269.
Koons, H. C.: 1989, ‘Observations of Larger-Amplitude, Whistler Mode Wave Ducts in the Outer Plasmasphere’, J. Geophys. Res. 94, 15383.
Koons, H. C. and Fennell, J. F.: 1984, ‘Fine Structure in Electrostatic Emission Bands between Electron Gyrofrequency Harmonics’, J. Geophys. Res. 89, 3015–3018.
Kessel, R. L., Chen, S.-H., Green, J. L., Fung, S. F, Boardsen, S. A., Tan, L. C., Eastman, T. E., Craven, J. D. and Frank, L. A.: 1996, ‘Evidence of High-Latitude Reconnection During Northward IMF: Hawkeye Observations’, Geophys. Res. Lett. 23, 583.
Kurth, W. S.: 1992, ‘Comparative Observations of Plasma Waves at the Outer Planets’, Adv. Space Res. 12, (8)83.
LeDocq, M. J., Gurnett, D. A. and Anderson, R. R.: 1994, ‘Electron Number Density Fluctuations Near the Plasmapause Observed by CRRES Spacecraft’, J. Geophys. Res. 99, 23661.
LeSager, P., Canu P. and Cornilleau-Wehrlin, N.: 1998, ‘Impact of the Ulysses Velocity on the Diagnosis of the Electron Density by the Unified Radio and Plasma Wave Sounder in the Outskirts of the Io Torus’, J. Geophys. Res. 103, 26, 667.
Lemaire, J.: 1975, ‘The Mechanisms of Formation of the Plasmapause’, Annales de Geophysique 31, 175.
Lemaire, J. and Gringauz, K. L: 1998, The Earth’s Plasmasphere, Cambridge University Press.
Lennartson, W. and Reasoner, D. C.: 1978, ‘Low Energy Plasma Observations at Synchronous Orbit’, J. Geophys. Res. 83, 2145.
Lockwood, G. E. K.: 1973, ‘Side Band and Harmonic Radiation from Topside Sounders’, J. Geophys. Res. 78, 2244.
Lund, E. J., Labelle, J. and Treumann, R. A.: 1995, ‘On Quasi-Thermal Noise Fluctuations Near the Plasma Frequency on the Outer Plasmasphere: a Case Study’, J. Geophys. Res. 99, 23651.
Matsumoto, H. and Usui, H.: 1997, ‘Intense Bursts of Electron Cyclotron Harmonic Waves near the Dayside Magnetopause Observed by GEOTAIL’, Geophys. Res. Lett. 24, 49.
Meyer-Vernet, N. and Perche, C.: 1989, ‘Toolkit for Antennae and Thermal Noise Near the Plasma Frequency’, J. Geophys. Res. 94, 2405.
Meyer-Vernet, N., Hoang S. and Moncuquet, M.: 1993, ‘Bernstein Waves in the Io Torus: a Novel Kind of Electron Temperature Sensor’, J. Geophys. Res. 98, 21163.
Meyer-Vernet, N., Moncuquet, M. and Hoang, S.: 1995, ‘Temperature Inversion in the Io Plasma Torus’, Icarus 116, 202.
Meyer-Vernet, N., Hoang, S., Issautier, K., Maksimovic, M., Manning, R., Moncuquet, M. and Stone, R.: 1998, ‘Measuring Plasma Parameters with Thermal Noise Spectroscopy’, in E. Borovsky and R. Pfaff (eds), Geophysical Monograph 103: Measurements Techniques in Space Plasmas, pp. 205–210.
Moncuquet, M., Meyer-Vernet, N., Bougeret, J.-L., Manning, R., Perche, C. and Kaiser, M. L.: 1995, ‘Wind Passes through the Outer Plasmasphere: Plasma Diagnosis from the Quasi-Thermal Noise Spectrum Measured by the Waves Experiment’, Suppl. Eos 76, 17, S221.
Moncuquet, M., Meyer-Vernet, N., Hoang, S., Forsyth, R. J. and Canu, P.: 1997, ‘Detection of Bernstein Wave Forbidden Bands: a New Day to Measure the Electron Density’, J. Geophys. Res. 102, 2373.
Moldwin, M. B., Thomsen, M. G., Bame, S. J., McComas, D. J. and Moore, K. R.: 1994, ‘An Examination of the Structure and Dynamics of the Outer Plasmasphere Using Multiple Geosynchronous Satellites’, J. Geophys. Res. 99, 11475.
Moldwin, M. B., Thomsen, M. F, Bame, S. J., McComas, D. and Reeves, G. D.: 1995, ‘The Fine-Scale Structure of the Outer Plasmasphere’, J. Geophys. Res. 100, 9649.
Newell, P. T.: 1995, ‘Do the Dayside Cusps Blink?’, Rev. Geophys. Suppl, U.S. national Report to IUGG, 665.
Ober, D. M., Horwitz, J. L. and Gallagher, D. L.: 1997, ‘Formation of Density Troughs Embedded in the Outer Plasmasphere by Subauroral Ion Drifts (SAID)’, J. Geophys. Res. 102, 14595.
Osherovich, V. A., Benson, R. F., Fainberg, J., Stone R. G. and MacDowall, R. J.: 1993a, ‘Sounder Stimulated Dn Resonances in Jupiter’s Io Plasma Torus’, J. Geophys. Res. 98, 18751.
Osherovich, V. A., Farrugia, C. J., Burlaga, L. F., Lepping, R. P., Fainberg, J. and Stone, R. G.: 1993b, ‘Polytropic Relationship in Interplanetary Magnetic Clouds’, J. Geophys. Res. 98, 15,331.
Oya, H.: 1972, ‘Turbulence of Electrostatic Electron Cyclotron Harmonic Waves Observed by Ogo 5’, J. Geophys. Res. 77, 3483.
Oya, H. and Ono, T.: 1987, ‘Stimulation of Plasma Waves in the Magnetosphere Using Satellite JIKIKEN (EXOS B) Part II: Plasma Density Across the Plasmapause’, J. Geomag. Geoelectr. 39, 591.
Park, C. G. and Carpenter, D. L.: 1970, ‘Whistler Evidence of Large-Scale Electron-Density Irregularities in the Plasmasphere’, J. Geophys. Res. 75, 3825.
Pierrard, V. and Lemaire, J.: 1996, ‘Lorentzian Ion Exosphere Model’, J. Geophys. Res. 101, 7923.
Potemra, T. A., Erlandson, R. E., Zanetti, L. J., Arnoldy, R. L., Woch, J. and Friis-Christensen, E.: 1992, ‘The Dynamic Cusp’, J. Geophys. Res. 97, 2835.
Reiff, P. H., Green, J. L., Benson, R. F., Carpenter, D. L., Calvert, W., Fung, S. F., Gallagher, D. L., Omura, Y., Reinisch, B. W., Smith, M. F. and Taylor, W. W. L.: 1994, ‘Remote Sensing of Substorm Dynamics via Radio Sounding, Substorms 2’, in J. R. Kan, J. D. Craven and S.-I. Akasofu (eds.), Proceedings of the Second International Conference on Substorms, University of Alaska Press, Fairbanks, Alaska, pp. 281–287.
Reiff, P.H., Boyle, C. B., Green, J. L., Fung, S. E, Benson, R. F., Calvert, W. and Taylor, W. W. L.: 1996, ‘Radio Sounding of Multiscale Plasmas’, in T. Chang and J. R. Jasperse (eds.), Physics of Space Plasmas, 14, MIT Press, Cambridge, MA, pp. 415–429.
Reinisch, B. W., Sales, G. S., Haines, D. M., Fung, S. F. and Taylor, W. W. L.: 1999, ‘Radio Wave Active Doppler Imaging of Space Plasma Structures: Angle-of-Arrival, Wave Polarization, and Faraday Rotation Measurements with RPF’, Radio Sci. 34, 1513–1524.
Reinisch, B. W., Haines, D. M., Bibl, K., Cheney, G., Galkin, I. A., Huang, X., Myers, S. H., Sales, G. S., Benson, R. E, Fung, S. E, Green, J. L., Taylor, W.W.L., Bougeret, J.-L., Manning, R., Meyer-Vernet, N., Moncuquet, M., Carpenter, D. L., Gallagher, D. L. and Reiff, P.: 2000, ‘The Radio Plasma Imager Investigation on the IMAGE Spacecraft’, Space Sci. Rev. 91, 319–359 (this issue).
Roelof, E. C. and Sibeck, D. G.: 1993, ‘Magnetopause Shape as a Bivariate Function of Interplanetary Magnetic Field Bz and Solar Wind Dynamic Pressure’, J. Geophys. Res. 98, 21421.
Scudder, J. D.: 1992, ‘On the Causes of Temperature Change in Inhomogeneous Low-Density Astrophysical Plasmas’, Astrophys. J. 398, 299.
Spiro, R. W., Harel, M., Wolf, R. A. and Reiff, P. H.: 1981, ‘Quantitative Simulation of a Magnetospheric Substorm, 3. Plasmaspheric Electric Fields and Evolution of the Plasmapause’, J. Geophys. Res. 86, 2261.
Stix, T. H.: 1962, The Theory of Plasma Waves, McGraw-Hill, New York, p. 27.
Taylor, H. A., Jr., Grebowsky, J. M. and Walsh, W. J.: 1970, ‘Structured Variations of the Plasmapause: Evidence of a Corotating Plasma Tail’, J. Geophys. Res. 76, 6806.
Warren, E. S.: 1969, ‘The Topside Ionosphere During Geomagnetic Storms’, Proc. IEEE 57, 1029.
Weiss, L. A., Lambour, R. L., Elphic, R. C. and Thomsen, M. F.: 1997, ‘Study of Plasmaspheric Evolution Using Geosynchronous Observations and Global Modeling’, Geophys. Res. Lett. 24, 599.
Yamauchi, M., Lundin, R. and Potemra, T. A.: 1995, ‘Dynamic Response of the Cusp Morphology to the Interplanetary Magnetic Field Changes: an Example Observed by Viking’, J. Geophys. Res. 100, 7661.
Xue, S., Reiff, P. H. and Onsager, T.: 1997, ‘Cusp Ion Injection and Number Density Modeling in Realistic Electric and Magnetic Fields’, Phys. Chem. Earth 22, 735.
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Green, J.L. et al. (2000). Radio Plasma Imager Simulations and Measurements. In: Burch, J.L. (eds) The Image Mission. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4233-5_12
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