Multipoint Plasma Density Measurements from Cluster Wave and Particle Instruments

Details Multipoint Plasma Density Measurements from Cluster Wave and Particle Instruments Multipoint Plasma Density Measurements from Cluster Wave and Particle Instruments

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0816p&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0816

Physics

2704 Auroral Phenomena (2407), 2772 Plasma Waves And Instabilities, 7867 Wave/Particle Interactions

Scientific paper

Measurements from instruments onboard the Cluster spacecraft are used to study regions of diminished plasma density inside and poleward of the nightside auroral zone. The plasma density is derived from the digitization of the electron plasma frequency cutoff of the whistler mode auroral hiss, using the electric field spectrum measurements from the Wideband Plasma Wave Instrument (WBD). Two nightside auroral zone crossings, on May 8 and July 21, 2001, each with simultaneous measurements from two Cluster spacecraft, have been selected for this study. Both of these intervals contain multiple low density structures and provide an opportunity to make multi-instrument comparisons of the WBD electric spectrum measurements with the electron plasma frequency measurements of the WHISPER experiment and the spacecraft potential measurements of the Electric Fields and Waves (EFW) experiment. Since the satellite potential measurements are very sensitive to variations in the electron density, EFW spacecraft potential and density measurements will complement the WBD density measurements in the low density regions. Density variations will also be compared to the observed ion fluxes, using the ion distribution functions of the Cluster Ion Spectrometry (CIS) instruments and the low energy electron fluxes, using the electron velocity and energy distributions of the Electron and Current Experiment (PEACE).

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