Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981plap.rept..135o&link_type=abstract
In ESA Plasma Astrophys. p 135-143 (SEE N82-20030 10-88)
Astronomy and Astrophysics
Astrophysics
Electron Density Profiles, Helios Satellites, Plasma Dynamics, Solar Wind, Voyager 2 Spacecraft, Coronal Holes, Distribution Functions, Hot Electrons, Ion Distribution, Radial Distribution
Scientific paper
Recent measurements, mostly from Helios and Voyager, were reviewed. The observational material was compiled into a series of radial profiles for various macroscopic plasma parameters. Several examples for experimentally determined three-dimensional distribution functions of protons are shown. The physical properties of the solar wind electrons were surveyed. The still unresolved question of the driving mechanism of the solar wind is considered. The problem of the energy balance in pure, high velocity streams emanating from solar coronal holes was outlined. It is suggested that the suprathermal electrons may play an important role in driving the wind. Numerical estimates, referring to the lower corona, are offered in support of this hypothesis.
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