Compressive character of low frequency waves driven by newborn ions at Comet Grigg-Skjellerup

Details Compressive character of low frequency waves driven by newborn ions at Comet Grigg-Skjellerup Compressive character of low frequency waves driven by newborn ions at Comet Grigg-Skjellerup

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20..267m&link_type=abstract

Advances in Space Research, vol. 20, p. 267

Computer Science

4

Grigg-Skjellerup Comet, Giotto Mission, Ion Cyclotron Radiation, Plasma Density, Compression Waves, Ion Distribution, Magnetic Fields, Low Frequencies

Scientific paper

The Giotto spacecraft has yielded LF wave observations for the weakly active Comet Grigg-Skjellerup; many of the waves are at frequencies close to the local water group ion cyclotron frequencies of both the magnetic field and plasma density over a wide region around the comet. A cross-analysis of magnetic field-derived electron parameters reveals a compressive wave component even at large distances from the nucleus. Quantitative agreement with these data is achieved by a theory of electromagnetic instabilities that are driven by the distribution of the newborn ions.

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