Measuring the Plasma Density Along the Magnetic Field: A Radio Sounding Technique

Details Measuring the Plasma Density Along the Magnetic Field: A Radio Sounding Technique Measuring the Plasma Density Along the Magnetic Field: A Radio Sounding Technique

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11a0775s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11A-0775

Computer Science

Sound

2730 Magnetosphere: Inner, 2768 Plasmasphere, 2794 Instruments And Techniques

Scientific paper

A new technique is introduced that remotely measures the plasma density profile in the plasmasphere. The Radio Plasma Imager (RPI) on board the IMAGE satellite transmits coded signals in the magnetosphere and receives the echoes. The sounding frequency and the time delay of an echo carry the information about the plasma density and distance at the reflection point of an echo. Echoes of the same mode from a given transmission sweep and arriving from the same (Poynting flux) direction should form a distinct trace on a plasmagram of echo amplitude as a function of frequency and time delay. From such a trace and a given dispersion relation, a density profile can be derived using a best-fit inversion algorithm. Sometimes, multiple echo traces appear in a single plasmagram of a complete frequency scan. We demonstrate how these traces may result from echoes of different wave modes propagating along the field into both hemispheres. We will show specific cases in which the inversion calculations are likely to yield the electron density profile along the field from one hemisphere to the other.

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