Helium and hydrogen velocity differences in the solar wind

Details Helium and hydrogen velocity differences in the solar wind Helium and hydrogen velocity differences in the solar wind

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2719a&link_type=abstract

Journal of Geophysical Research, vol. 81, June 1, 1976, p. 2719-2727. ERDA-sponsored research.

Other

25

Helium, Hydrogen, Plasma Diagnostics, Solar Wind Velocity, Velocity Measurement, Imp, Interplanetary Magnetic Fields, Ion Beams, Long Term Effects, Magnetohydrodynamic Waves

Scientific paper

Scalar and vector velocity differences between helium and hydrogen ions in the solar wind measured with the plasma analyzers on Imp 6 and Imp 7 are presented and interpreted. From the bulk speeds of azimuthal components of flow direction for both types of ions the ecliptic projection of the helium to hydrogen velocity difference vector is determined. Short-term and long-term average properties of this vector, at times contrasted with the more usually reported bulk speed difference, are principal subjects of this paper. The vector is usually found aligned with the proton heat flux vector and therefore is directed predominantly outward from the sun. Sometimes preceding high-speed streams and during fluctuations the vector is directed back toward the sun. There is a statistical correlation between the magnitude of the vector and the wind speed. In high-speed streams or in other magnetically disturbed regions the vector difference magnitude often remains nearly constant, while the bulk speed difference undergoes large changes as the difference vector rotates in alignment with the magnetic fields.

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