Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.7731l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, May 1, 1991, p. 7731-7757. Research supported by Vilho, Yrjo ja Kalle
Physics
2
Cold Plasmas, Electric Field Strength, Electron Energy, Halley'S Comet, Plasma Dynamics, Electron Density (Concentration), Electrostatic Probes, Solar Wind Velocity, Vega Project
Scientific paper
The structure and dynamics of the plasma environment on the sunward side of Comet Halley are investigated using measurements during the Vega inbound encounters from a double probe antenna and two Langmuir probes (the APV-V experiment), within a cometocentric distance of about 850,000 km. Based upon the behavior of the electric fields and the cold electrons, three regions can be identified in the cometosheath (in particular during the Vega 1 approach): transition layers are passed through at about 780,000 km (R1) and about 360,000 km (R2). The outer cometosheath (near and beyond R1) is characterized by large-scale variations in the cold electron density and the electric field, peaking at about 1 mHz. The R2 crossing is detected in the plasma wave data as enhanced fluctuations at about 15 mHz. About 25,000 km downstream of R2, the spacecraft traverses a current layer (thickness about 10,000 km) indicated by a sharp gradient in the dc electric field and the cold electron density. The continuous, relatively rapid increase in the intensity of plasma waves begins at a cometocentric distance of about 200,000 km. Simultaneously, the cold electron density stars growing in accordance with the r/2 law. In the cometary plasma region, some interesting features are examined, such as a current layer passed by Vega 1 at 54,000 km and sudden ion density enhancements observed by Vega 2 at about 35,000 km. On several occasions, the APV-V measurements are heavily influenced by dust particles striking the spacecraft structure. It is concluded that the dust particles are strongly charged and partially coupled to cometary plasmas (or vice versa).
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