Comet Halley neutral gas density profile along the VEGA 1 trajectory measured by NGE

Details Comet Halley neutral gas density profile along the VEGA 1 trajectory measured by NGE Comet Halley neutral gas density profile along the VEGA 1 trajectory measured by NGE

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.250a.391c&link_type=abstract

In ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 1: Plasma and Gas p 391-395 (SEE N87

Computer Science

2

Density Measurement, Halley'S Comet, Neutral Gases, Vega Project, Cometary Atmospheres, Gas Analysis, Gas Ionization, Ion Production Rates

Scientific paper

Two complementary gas analyzers comprised the Neutral Gas Experiment (NGE) on the two Vega spacecraft. Data returned from the VEGA 1 experiment have permitted the determination of the total neutral gas density profile along the spacecraft trajectory. Discounting small fluctuations, the FIS instrument measured a density profile which varied approximately as the inverse radial distance squared. Data from the EIS instrument yielded a series of calibration points: e.g., the neutral density at 105km is about 104cm-3. The combined data provide a calibrated total density profile, and imply a neutral production rate of 1×1030molecules per second.

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