Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0832d&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0832
Physics
2740 Magnetospheric Configuration And Dynamics, 2772 Plasma Waves And Instabilities, 2794 Instruments And Techniques, 6939 Magnetospheric Physics, 7803 Active Perturbation Experiments
Scientific paper
Whisper, the high frequency wave analyser and sounder instrument on board the Cluster mission, provides, via the identification of the plasma frequency, a reliable and precise measurement of the electron density in most regions explored by the four spacecraft. The spatial density gradient can be calculated from differential measurements yielded by the four points constellation. Combined with simple estimations of boundary drift velocities, they are used to derive time and space characteristics of density structures crossed in various regions of the magnetosphere. The instrument measures natural emissions over the 2 - 80 kHz frequency range in short time intervals allowing the derivation of directivity properties. We present observations of electrostatic and electromagnetic natural emissions recorded in several magnetospheric regions and indicate perspectives allowed by the multipoint measurements of Cluster.
Canu Paolo
Darrouzet Fabien
Décréau P. M.
Harvey Chris
Krasnosselskikh V. V.
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