Remote Detection of Small Scale Plasma Density Irregularities in the Outer Plasmasphere Using the Radio Plasma Imager on the IMAGE Spacecraft

Details Remote Detection of Small Scale Plasma Density Irregularities in the Outer Plasmasphere Using the Radio Plasma Imager on the IMAGE Spacecraft Remote Detection of Small Scale Plasma Density Irregularities in the Outer Plasmasphere Using the Radio Plasma Imager on the IMAGE Spacecraft

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0780b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0780

Physics

2730 Magnetosphere: Inner, 6939 Magnetospheric Physics, 6964 Radio Wave Propagation, 6969 Remote Sensing

Scientific paper

One of the main objectives of the Radio Plasma Imager (RPI) on the IMAGE spacecraft is the observation of the Earth's magnetized plasma from the satellite's polar orbit, with apogee of approximately 8 Earth radii and perigee near 1200 km altitude. During soundings of the plasma from both outside and inside the plasmasphere, RPI echoes are usually not the discrete traces on range-vs-frequency records (plasmagrams) that ray tracing simulations predict. Instead they exhibit various amounts of range spreading, from approximately 0.5 to 2 Earth radii in virtual range. In the present paper we examine a particular type of spread echo with ranges between IMAGE and the nominal reflection points of the waves. Such echoes are commonly found during soundings along IMAGE orbital segments extending from the plasmapause region to L 2 within the plasmasphere. We consider the possibility that the range spread may be caused by coherent backscatter of the RPI signal due to the presence of small scale plasma density irregularities in the region between the spacecraft and the nominal reflection point of the waves. Observation of this type of backscatter process can yield information both on the scale and amplitude of the irregularities.

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