Comparison of Various Numerical Techniques for Determining Plasma Densities From Field Aligned Echoes Observed by RPI/IMAGE

Details Comparison of Various Numerical Techniques for Determining Plasma Densities From Field Aligned Echoes Observed by RPI/IMAGE Comparison of Various Numerical Techniques for Determining Plasma Densities From Field Aligned Echoes Observed by RPI/IMAGE

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21a..11j&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM21A-11

Physics

2730 Magnetosphere: Inner, 2768 Plasmasphere, 6964 Radio Wave Propagation, 6984 Waves In Plasma

Scientific paper

Plasmagrams from the Radio Plasma Imager (RPI) on the IMAGE satellite often show multiple echoes over a common range of frequencies but different virtual range regimes. These echo signatures have been interpreted as field-aligned echoes. By inverting these echoes a determination of the electron density along a field line can be achieved. One can use different numerical techniques to compute electron densities along the magnetic field line from the observed field-aligned echoe traces. The three techniques available are 1) field-aligned ray tracing; 2) profile inversion along the ray trajectory (Reinisch et al., Geophys. Res. Lett., 28, 4521, 2001); and 3) power law electron density scaling model. The field-aligned ray tracing method uses a background magnetic field model with a variable model electron density which are used to compute the group velocity - for a given wave mode, wave normal angle and frequency. We simulate the echo trace by iteratively modifying the electron density until we get a good match with the observed echo trace. The three techniques should in principle give the same density profiles within a certain degree of accuracy. In this presentation we will compare the results obtained from these three techniques and discuss possible sources of error.

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