On the equation of state of solar wind ions derived from HELIOS measurements

Details On the equation of state of solar wind ions derived from HELIOS measurements On the equation of state of solar wind ions derived from HELIOS measurements

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.2982m&link_type=abstract

Journal of Geophysical Research, vol. 88, Apr. 1, 1983, p. 2982-2992.

Physics

37

Equations Of State, Ion Distribution, Ion Temperature, Magnetic Moments, Satellite Observation, Solar Wind Velocity, Alpha Particles, Coulomb Collisions, Heat Flux, Helios Satellites, Internal Energy, Plasma Diagnostics, Radial Distribution, Temperature Profiles, Thermal Energy

Scientific paper

The radial evolution of such adiabatic invariants as the ion magnetic moments are studied on the basis of solar wind ion velocity distribution observations made by the Helios spacecraft between 0.3 and 1 AU. Significant differences between proton and alpha-particle parameters in wind velocity dependence are noted, and adiabaticity is on the average found to be violated. This violation is interpreted as evidence that protons are heated perpendicular to the field in fast streams. The contribution of the differential streaming energy to the total internal energy of the ions is also considered, and average heliocentric radial profiles for the ion heat fluxes are presented together with an examination of a possible ion heat flux role in the supply of thermal energy during the winds radial expansion. The present findings suggest that wave-particle interactions, and/or Coulomb collisions, are required to explain solar wind ion thermal energy states and radial temperature profiles.

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