Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gmis.rept..173e&link_type=abstract
In ESA The Giotto Mission: Its Scientific Investigations p 173-186 (SEE N86-32473 24-12)
Physics
Giotto Mission, Halley'S Comet, Polarimeters, Satellite-Borne Instruments, Comet Heads, Cometary Atmospheres, Interplanetary Dust, Interplanetary Gas
Scientific paper
The scientific objectives of the Giotto Radio Science Experiment (GRE) are to determine the columnar electron content of Comet Halley/s ionosphere and the cometary mass fluence from atmospheric drag by using the radio signals from Giotto during the Halley encounter. The radio science data (S and X-band Doppler and range measurements) will be collected at NASA/s deep-space 64 m tracking antenna at Tidbinbilla near Canberra, in Australia. In order to separate the effects of the terrestrial ionosphere and the interplanetary plasma, S-band Doppler measurements will also be taken at Tidbinbilla along the line-of-sight of Japan/s cometary probe Sakigake during the Giotto-Halley Encounter. The measurements of cometary electron content and mass fluence will be inverted to derive the spatial distribution of the electron and mass (dust and gas) density within Halley/s coma. The GRE is the only experiment on Giotto capable of measuring the low-energy (10 eV) electron bulk population of Halley/s ionosphere and the total cometary mass flow impacting upon the spacecraft.
Bird Michael K.
Buschert H.
Edenhofer Peter
Esposito Pasquale B.
Porsche Herbert
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