Pioneer Venus Lyman-alpha observations of Comet P/Giacobini-Zinner and the life expectancy of cometary hydrogen

Details Pioneer Venus Lyman-alpha observations of Comet P/Giacobini-Zinner and the life expectancy of cometary hydrogen Pioneer Venus Lyman-alpha observations of Comet P/Giacobini-Zinner and the life expectancy of cometary hydrogen

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13..385c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 13, April 1986, p. 385-388.

Astronomy and Astrophysics

Astronomy

21

Astronomical Spectroscopy, Comet Heads, Giacobini-Zinner Comet, Hydrogen, Coma, Flyby Missions, Lyman Alpha Radiation, Particle Trajectories, Pioneer Venus Spacecraft, Solar Wind, Three Dimensional Models, Comets, Giacobini-Zinner, Pioneer Venus Orbiter, Lyman-Alpha Radiation, Pvo, Hydrogen, Comae, Spacecraft Observations, Analysis, Particles, Trajectories, Models, Water, Production Rate, Fluorescence, Ouvs, Solar Wind, Ice Mission, Ultraviolet, Wavelengths, Emissions, Orbiter Ultraviolet Spectrometer

Scientific paper

Results are given of the Pioneer Venus observation of the hydrogen coma of Comet P/Giacobini-Zinner on September 11, 1985 during the fly-by conducted by the International Cometary Explorer (ICE). Analysis of the data with a time-dependent 3-D particle-trajectory model implies a water production rate of 2.2 x 10 to the 28 per second on that day. The model includes the irregular variations in the H lifetime and the H Lyman-alpha fluorescence rate determined from simultaneous measurements of the solar wind by ICE and of the solar UV by the Solar Mesosphere Explorer (SME), respectively. The H lifetime varied from 2 x 10 to the 5 to 3 x 10 to the 6 seconds during the 42 days preceding the observation.

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