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Determination of interstellar helium parameters from the ULYSSES-NEUTRAL GAS experiment: Method of data analysis.

Rosenbauer, H.; Witte, M.; Banaszkiewicz, M.

The GAS instrument on board the ULYSSES spacecraft has, for the first time, measured directly the interstellar flux of helium atoms in the inner solar system. From the locally measured angular distribution of the flux, the task is to derive the five parameters of the Maxwellian distribution function: density, bulk velocity vector, and temperature …