Solar wind interaction with interstellar helium

Details Solar wind interaction with interstellar helium Solar wind interaction with interstellar helium

Aug 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980p%26ss...28..799g&link_type=abstract

Planetary and Space Science, vol. 28, Aug. 1980, p. 799-802. Research supported by the Heinrich Hertz Stiftung.

Physics

Helium, Interstellar Gas, Plasma Interactions, Solar Wind, Ion Temperature, Magnetohydrodynamics, Solar Wind Velocity

Scientific paper

Solar wind interaction with neutral interstellar helium focused by the sun's gravity in the downwind solar cavity is discussed in a hydrodynamical approach. Upon ionization the helium atoms 'picked up' by the (single fluid) solar wind plasma cause a slight decrease in the wind speed and a corresponding marked temperature increase. For neutral helium density outside the cavity equal to 0.01 atoms/cu cm and for interstellar kinetic temperature T(He) = 10,000 K, the reduction is speed of the solar wind on the downwind axis at 10 AU from the sun amounts to about 2 km/s; the solar wind temperature excess attains 7000 K. The resulting pressure excess leads to a non-radial flow of the order of 0.25 km/s. The possibility of experimental confirmation is discussed.

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