Detection of interstellar pick-up hydrogen in the solar system

Details Detection of interstellar pick-up hydrogen in the solar system Detection of interstellar pick-up hydrogen in the solar system

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...261...70g&link_type=abstract

Science (ISSN 0036-8075), vol. 261, no. 5117, p. 70-73.

Astronomy and Astrophysics

Astronomy

192

Hydrogen, Interstellar Matter, Solar System, Solar Wind, Ionized Gases, Spaceborne Astronomy, Velocity Distribution

Scientific paper

Interstellar hydrogen ionized primarily by the solar wind has been detected by the Solar Wind Ion Composition Spectrometer instrument on the Ulysses spacecraft at a distance of 4.8 AUs from the sun. This 'pick-up' hydrogen is identified by its distinct velocity distribution function, which drops abruptly at twice the local solar wind speed. From the measured fluxes of pick-up protons and singly charged helium, the number densities of neutral hydrogen and helium in the distant regions of the solar system are estimated to be 0.077 +/- 0.015 and 0.013 +/- 0.003 per cu cm, respectively.

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