Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.6599m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Aug. 1, 1984, p. 6599-6612. Sponsorship: Bundesministerium für Forsch
Physics
40
Helios Satellites, Plasma Diagnostics, Solar Wind, Angular Momentum, Dimensionless Numbers, Expansion, Heat Flux, Kinetic Energy, Magnetic Flux, Particle Acceleration
Scientific paper
Helios particle and magnetic field observations between 0.3 and 1 AU are used to determine plasma parameters that characterize the bulk and internal energy state of the solar wind. Quantities expected to be conserved in a time-stationary flow with local spherical symmetry in the ecliptic plane are actually found to be invariant within measurement uncertainties. These are the total mass, energy, and angular momentum fluxes for the anisotropic solar wind plasma composited by electrons, protons, and alphas. The observational findings indicate that the heat flux beyond 0.3 AU is observationally too small to cause a strong departure from adiabaticity. The solar wind expansion may be conceived in terms of a 'single particle' moving in the binding gravitational potential and in the accelerating thermal (enthalpy and heat fluxes) and magnetorotational (azimuthal kinetic energy and Poynting flux) potentials. The radial profiles of these potentials are derived from observations.
Marsch Eckart
Richter Arne K.
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