ELF plasma waves near Comet Halley

Details ELF plasma waves near Comet Halley ELF plasma waves near Comet Halley

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pazh...12..688k&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 12, Sept. 1986, p. 688-695) Soviet Astronomy Letters (ISSN 0360-0327), vol. 12, Sept.-O

Astronomy and Astrophysics

Astronomy

3

Extremely Low Frequencies, Halley'S Comet, Ion Production Rates, Plasma Frequencies, Plasma Oscillations, Plasma Waves, Comet Nuclei, Cometary Atmospheres, Electron Energy, Ion Density (Concentration), Shock Waves, Vega Project

Scientific paper

On approach to Comet Halley the APV-N low-frequency detectors carried by the Vega spacecraft recorded plasma-wave intensity enhancements, representing the inbound crossing of quasi-perpendicular (Vega 1) or quasi-parallel (Vega 2) shocks located (1.0-1.3) x 10 to the 6th km from the nucleus. Distinctive postshock plasma oscillations were also detected, as well as waves due to dust impacts on the sensors and on the spacecraft. Plasma waves were excited through anomalously rapid ionization of the cometary atmosphere by suprathermal electrons, presumably because of the critical ionization-velocity phenomenon.

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