Computer Science
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278...97g&link_type=abstract
In its Proceedings of the International Symposium on the Diversity and Similarity of Comets p 97-105(SEE N88-21884 14-91)
Computer Science
1
Giacobini-Zinner Comet, Halley'S Comet, International Sun Earth Explorer 3, Plasma Interactions, Plasma Waves, Solar Wind, Vega Project, Flyby Missions, Plasma Diagnostics, Plasma Probes, Satellite-Borne Instruments
Scientific paper
Amplitude and spectral features recorded by the ICE plasma wave instrument for the Giacobini-Zinner comet are compared with VEGA APV-V data for Halley. The better sensitivity of the ICE instrument makes easier the identification of phenomena such as electron plasma oscillations and the detection of weak turbulences at large distances from its nucleus. The magnetic antenna on ICE facilitates the differentiation between electromagnetic and electrostatic modes. The spectral amplitudes measured on the shock and foreshock regions are comparable for the two comets, and a general increase of wave activity is observed when the spacecraft enters the cometosheath. The data collected in the inner regions are drastically different. A significant reduction of wave activity is observed in the tail of Giacobini-Zinner, indicating that most of the solar wind energy is dissipated in the outer environment. A general increase of noise is observed at all frequencies after crossing the cometopause of Halley, due to the interaction of the plasma flow with the cometary medium and to the impact of dust particles.
Grard Rejean
Mogilevsky Mikhail
Scarf F.
Trotignon Jean Gabriel
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