Plasma waves observed during plasmapause crossings

Details Plasma waves observed during plasmapause crossings Plasma waves observed during plasmapause crossings

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0823m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0823

Physics

2768 Plasmasphere, 2772 Plasma Waves And Instabilities, 7868 Wave/Wave Interactions

Scientific paper

Different types of plasma waves are observed during plasmapause crossings with the 4 CLUSTER satellites. Using WHISPER, STAFF and EFW data, we investigate the electromagnetic and electrostatic waves with frequency below the electron cyclotron frequency (fce), at fce (10-15 kHz), between harmonics of fce, and at near the plasma frequency (fp, 20-220 kHz). The waves are interpreted with respect to local density structures that have steep density gradients covering up to a few hundreds per cm3. Each of these density enhancements corresponds to an incursion into a plasmaspheric like plasma. Below the WHISPER observation limit, 80 kHz, the plasma density is inferred from the local fp emission and is used to obtain a relationship between spacecraft potential and density. Above 80 kHz, this relationship serves to determine fp from the spacecraft potential. Thus a density measurement is provided in a region where often particle instruments do not operate. Attempts are made to identify and inter-relate the observed waves using multi-point analysis. An interpretation on the density structures and the low frequency electromagnetic waves is also proposed in a companion paper (A. Masson et al.).

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