Variations of the hydrodynamic parameters of solar wind protons and alpha particles from Prognoz-7 measurements.

Details Variations of the hydrodynamic parameters of solar wind protons and alpha particles from Prognoz-7 measurements. Variations of the hydrodynamic parameters of solar wind protons and alpha particles from Prognoz-7 measurements.

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990cosre..28..190e&link_type=abstract

Cosmic Res., Vol. 28, No. 2, p. 190 - 196

Computer Science

Solar Wind: Protons, Solar Wind: Elementary Particles

Scientific paper

The variations and relations between the hydrodynamic parameters of the proton and α components of the solar wind have been investigated from the results of selective measurements of these components at the Prognoz-7 satellite. The parameter values averaged over the observation interval agree with their long-period variations during the solar cycle. With an increase in the solar wind velocity vp, the temperature Tp increases on the average as the power law v2.4p, while the concentration n decreases such that the momentum flux nvp2 is almost constant in the slow solar wind, but increases in the high-speed solar wind. The correlation observed between the temperature ratio Tα/Tp and the magnitude of the difference of the α-particle and proton velocities |vα-vp| suggests that the preferential heating of the α particles is due not only to preferential acceleration of the α particles, but also to any significant shift between the maxima of the α-particle and proton distribution functions in velocity space. The conditions in the solar wind affecting the variation of the relative α-particle abundance nα/np are investigated, along with the role of Coulomb viscosity of the components in balancing the difference in the velocities and temperatures of the protons and α particles.

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