An Inner-Magnetospheric Electron Density Database Determined from IMAGE/RPI Passive Dynamic Spectra

Details An Inner-Magnetospheric Electron Density Database Determined from IMAGE/RPI Passive Dynamic Spectra An Inner-Magnetospheric Electron Density Database Determined from IMAGE/RPI Passive Dynamic Spectra

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm12a..04w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM12A-04

Physics

2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2788 Magnetic Storms And Substorms (7954), 2794 Instruments And Techniques

Scientific paper

The magnetospheric electron density (Ne) is a fundamental space-physics parameter. It is often difficult to make Ne measurements to an accuracy better than a factor of two in low-density (Ne ~ 1 cm-3 or less) space plasmas due to problems associated with spacecraft/plasma interactions which become enhanced in such an environment. Plasma-wave techniques can provide accurate Ne measurements if the wave modes of the received signals can be properly identified. The amplitudes of the signals received by the Radio Plasma Imager (RPI) on the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) satellite during passive observations are displayed as a function of frequency and time to form a dynamic spectrum. A semi-automated fitting technique has been developed to extract Ne from these dynamic spectra. The fitting method considers physical features found in the dynamics spectra, such as the upper-hybrid band, the continuum edge, and banded emissions. This technique is often able to provide in situ Ne measurements along extended portions of the orbit of IMAGE. With nearly five years of data from 2001 to 2005, the 14-hour orbit of IMAGE resulted in ~ 6000 separate dynamic spectra. This semi-automated method allows the dynamic spectra to be analyzed in a timely manner to determine Ne. The results have been used to form a plasmaspheric Ne database that is being made available to the scientific community.

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