Observation by Pioneer 7 of He + in the distant coma of Halley's comet

Observation by Pioneer 7 of He + in the distant coma of Halley's comet

During the approach of Pioneer 7 to a distance of 12.1 × 10 6 km from the nucleus of Comet P/Halley on March 20, 1986, features were observed in plasma analyzer data that we interpret as He + produced by charge exchange of solar wind He ++ with neutral cometary material. The maximum flux of the He +...

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Veröffentlicht in:Icarus (New York, N.Y. 1962) N.Y. 1962), 1987-07, Vol.71 (1), p.192-197
Hauptverfasser: Mihalov, J.D., Collard, H.R., Intriligator, D.S., Barnes, A.
Format: Artikel
Sprache:eng
Schlagworte:
640107 - Astrophysics & Cosmology- Planetary Phenomena
Astronomy
CHARGED PARTICLES
CHEMICAL COMPOSITION
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMETS
Earth, ocean, space
Exact sciences and technology
HALLEY COMET
HELIUM IONS
INTERACTIONS
Interplanetary space
IONS
PIONEER SPACE PROBES
PLASMA DIAGNOSTICS
SOLAR ACTIVITY
Solar system
SOLAR WIND
SPACE VEHICLES
TIME DEPENDENCE
VEHICLES
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Zusammenfassung:During the approach of Pioneer 7 to a distance of 12.1 × 10 6 km from the nucleus of Comet P/Halley on March 20, 1986, features were observed in plasma analyzer data that we interpret as He + produced by charge exchange of solar wind He ++ with neutral cometary material. The maximum flux of the He + was observed several hours after the closest approach of the spacecraft to the nucleus, and is unexpectedly large. Remarkable large discontinuous flux changes were also observed.
ISSN:0019-1035
1090-2643
DOI:10.1016/0019-1035(87)90172-2