The interstellar neutral-gas experiment on ULYSSES

Details The interstellar neutral-gas experiment on ULYSSES The interstellar neutral-gas experiment on ULYSSES

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...92..333w&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 92, no. 2, Jan. 1992, p. 333-348. Research supported by BMFT

Astronomy and Astrophysics

Astrophysics

34

Interstellar Gas, Interstellar Matter, Neutral Gases, Satellite-Borne Instruments, Ulysses Mission, Angular Distribution, Gravitational Fields, Solar Gravitation, Solar System

Scientific paper

The properties (density, bulk velocity relative to the solar system, and temperature) of the local interstellar gas, represented by neutral helium penetrating the heliosphere, will be measured in situ for the first time by the Ulysses Gas instrument. By employing the solar gravitational field as a natural velocity analyzer, the bulk velocity relative to the solar system and the temperature of the gas can be derived from the angular distributions of the particles measured in at least two widely separated points in the heliosphere. The gas density can be determined if a composition corresponding to cosmic abundances is assumed. The neutral particles are detected via the secondary electrons or ions which are emitted upon particle impact from a freshly deposited lithium-fluoride (LiF) layer. The physical principles and assumptions on which the experiment is based, the main technical features of the instrument, and first measurements in space are briefly described.

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