Altitude Profiles of Plasma Density in the Trough Region derived from Radio Plasma Imager Observations on the Image Spacecraft

Details Altitude Profiles of Plasma Density in the Trough Region derived from Radio Plasma Imager Observations on the Image Spacecraft Altitude Profiles of Plasma Density in the Trough Region derived from Radio Plasma Imager Observations on the Image Spacecraft

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm52a0549b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM52A-0549

Computer Science

Sound

2400 Ionosphere, 6934 Ionospheric Propagation (2487), 6964 Radio Wave Propagation, 6969 Remote Sensing, 6984 Waves In Plasma

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 perigee passes in the trough region just poleward of the plasmapause, RPI echoes indicate 200 - 300 kHz HF sounding pulses are often ducted to higher altitudes by irregularites near the plasmapause surface. The echoes appear in an HF frequency range just above the Z mode cutoff at the spacecraft location. Multiple reflections occur within these ducts from reflection points below and above the spacecraft, resulting in multiple echoes received on IMAGE. Because the multiple echoes allow enhanced time resolution, the apparent range of the duct upper reflection point can be determined to a high degree of accuracy. Using the range information in conjunction with ray tracing calculations, we derive altitude profiles of the cold plasma density in the trough region, a region where the characteristics of the cold plasma density are poorly known.

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