The ULYSSES neutral gas experiment - Determination of the velocity and temperature of the interstellar neutral helium

Details The ULYSSES neutral gas experiment - Determination of the velocity and temperature of the interstellar neutral helium The ULYSSES neutral gas experiment - Determination of the velocity and temperature of the interstellar neutral helium

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..121w&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 6, p. 121-130.

Computer Science

151

Gas Temperature, Helium, Interstellar Gas, Neutral Gases, Ulysses Mission, Velocity Measurement, Backscattering, Solar Wind

Scientific paper

A new technique to directly detect low energy neutral helium has been developed and successfully used in space for the first time. It makes possible the in situ measurement of the local angular distribution of the flow of interstellar neutral helium in the inner heliosphere. Based on the transformation of a velocity distribution, using Liouville's theorem, a straightforward model has been developed to determine, from these measurements, the flow parameters of the interstellar helium at infinity. From 12 measurements at radial distances between 1 and 5 AU, average values of the flow parameters were determined, namely: v(infinity) = 26 +/- 1 km/s, downstream direction: lambda(infinity) = 72 +/- 2.4 deg, beta(infinity) = -2.5 +/- 2.7 deg, temperature T(infinity) = 6700 +/- 1500 K. These values are in agreement with results found by completely different methods, although in detail there are significant differences.

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