Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987esasp.278..119b&link_type=abstract
In ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets p 119-124 (SEE N88-21884 14-91)
Physics
Comet Nuclei, Cometary Atmospheres, Halley'S Comet, Plasma Diagnostics, Vega Project, Cometary Magnetospheres, Heavy Ions, Ion Cyclotron Radiation, Magnetic Storms, Magnetohydrodynamic Stability, Plasma Acceleration, Plasma Density
Scientific paper
The plasma phenomena observed on board VEGA-1 and -2 spacecraft inside the cometary plasma region are summarized and their nature is discussed. The observed quasi-periodic modulation of the heavy ion density in this region could be explained by the development of the large-scale instability connected with the cyclotron resonance of ions with Alfven oscillations. The occurrence of 1 keV electrons during VEGA-2 flyby could be a signature of sporadic magnetospheric substorms in the cometary atmosphere. Plasma and magnetic field observations near VEGA-1 closest approach to the nucleus give evidence of super-Alfvenic cometary plasma acceleration initiated by interaction of two portions of different polarity magnetic fields.
Balebanov V. M.
Gringauz K. I.
Verigin Mikhail I.
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