NASA NTRS · 19730002087
Interstellar helium in interplanetary space
Abstract
The velocity distribution function of He(+) in the solar wind at 1 AU is calculated with the assumption that the source is photoionization of a cold (T = 100 K), neutral interstellar wind. If the spiral magnetic field is noise free, the velocity distribution is diffuse and would not produce a peak at 4(E over Q) sub H in an E over Q particle spectrum. If the velocity of the interstellar wind with respect to the sun lies in the ecliptic, a large variation of the He(+) number density with respect to ecliptic longitude is expected.
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Feldman, W. C., Lange, J. J., Scherb, F.. 1972-01-01. Interstellar helium in interplanetary space. https://ntrs.nasa.gov/citations/19730002087
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