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Hydrogen and helium velocities in the solar wind

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Abstract

Examination of separately determined helium and hydrogen bulk speeds in the solar wind show these to be equal, both on time scales of 30 min and 3 min. Observations of two interplanetary shocks and 12 discontinuities show the changes in bulk speed across them to take place simultaneously for the two species. Observations made at times of high helium abundance following an interplanetary shock, and at times of observation of colliding streams in the plasma, confirm the conclusion that, if bulk speed differences between species occur, they do so very rarely.

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Authors and Affiliations

  1. Laboratory for Extraterrestrial Physics, NASA-Goddard Space Flight Center, Greenbelt, Md., U.S.A.

    K. W. Ogilvie

  2. Institute for Fluid Dynamics and Applied Mathematics, University of Maryland, College Park, Md., U.S.A.

    H. J. Zwally

Authors
  1. K. W. Ogilvie
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  2. H. J. Zwally
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Additional information

Research supported by NASA Grant NsG 21-002-311, and computer time provided by Computer Science Center of the University of Maryland.

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Ogilvie, K.W., Zwally, H.J. Hydrogen and helium velocities in the solar wind. Sol Phys 24, 236–242 (1972). https://doi.org/10.1007/BF00231100

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  • DOI: https://doi.org/10.1007/BF00231100

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