A comparison of the ion density measured simultaneously by a wave and a particle instrument

Details A comparison of the ion density measured simultaneously by a wave and a particle instrument A comparison of the ion density measured simultaneously by a wave and a particle instrument

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1833k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1833-1841. Research supported by SERC.

Computer Science

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3

Ampte (Satellites), Magnetospheric Electron Density, Magnetospheric Ion Density, Atmospheric Sounding, International Sun Earth Explorer 1, Plasma Frequencies, Shock Waves, Solar Terrestrial Interactions

Scientific paper

Comparisons have been made between the equivalent electron number density calculated from the ion instrument on the AMPTE-UKS and the electron number densities calculated with the wave instrument on AMPTE-UKS and the passive sounder on ISEE 1. Comparisons are made between the density values determined from the ion and wave instruments according to the location of the spacecraft in the foreshock region. If the spacecraft is on the edge of the electron foreshock where the spectrum is narrow, the emissions are at the plasma frequency so that a direct comparison is possible. Further into the foreshock region, the spectrum is wider with a low-frequency cutoff at the plasma frequency. In this region, the density from the ion instrument must be compared with the lower edge of the wave band. Still further downstream of the foreshock boundary, the spectrum intensity is distributed symmetrically above and below the plasma frequency. In this region the density from the ion instrument must be compared with the center of the wave band. For low number densities (about 3/cu cm) and medium number densities (about 7/cu cm) the agreement is within 5 percent. For higher number densities (about 20/cu cm) the values from the ion instrument are within 15 percent of the number density values estimated from the AMPTE-UKS wave instrument.

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