Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..360c&link_type=abstract
Astronomy and Astrophysics, Vol.187, NO. 1+2/NOV, P. 360, 1987
Astronomy and Astrophysics
Astrophysics
11
Scientific paper
Two complementary gas analyzers comprised the Nautral Gas Experiment on the two Vega spacecraft sent to comet Halley. Although no significant mass spectra were obtained, data returned from the Vega-1 experiment have permitted the determination of the total neutral gas density profile along the spacecraft trajectory during the comet encounter. 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 a radial distance of 105km was about 104cm-3. The combined data provided a calibrated total density profile, and implied a neutral production rate of 1 × 1030molecules/second (assuming an outflow velocity of 1 km s-1) during the hours prior to the spacecraft encounter.
Afonin Valeri
Curtis Christina
Dyachkov A. V.
Ero Jr. J.
Fan Chang-Yun
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