On the relative magnitude of streaming velocities of alpha particles and protons at 1 AU |
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Authors: | S Cuperman N Metzler |
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Affiliation: | (1) Dept. of Physics and Astronomy, Tel Aviv University, Ramat Aviv, Israel |
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Abstract: | The occurrence at a heliocentric distance of 1 AU of alpha particle streaming velocities larger than proton streaming velocities,v
/v
p
>1 (Ogilvie, 1975) is investigated on the basis of the theory suggesting the existence in the solar wind of an accelerating force acting preferentially on the alpha particles.Accurate solution of the three-fluid model equations for the quiet solar wind indicates that anecessary andsufficient condition for (v
/v
p
)1 AU>1 is the presence of a relativelyweak accelerating forceacting in a limited region in the vicinity of 1 AU. If the force is effectiveonly at small heliocentric distances, the alpha particle streaming velocity excess vanishes at distances less than 1 AU, because of the (equalization) action of the dynamical friction force. |
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Keywords: | |
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