The far reaches of the solar wind - Pioneer 10 and Pioneer 11 plasma results

Details The far reaches of the solar wind - Pioneer 10 and Pioneer 11 plasma results The far reaches of the solar wind - Pioneer 10 and Pioneer 11 plasma results

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..339k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 339-346.

Astronomy and Astrophysics

Astrophysics

34

Pioneer Space Probes, Plasma Diagnostics, Solar Wind, Space Plasmas, Flux Quantization, Radial Distribution, Solar Protons, Solar Wind Velocity, Steady Flow

Scientific paper

Selected plasma parameters observed by Pioneer 10 and Pioneer 11 between launch (1972 and 1973) and the end of 1979 are used to find the large-scale radial structure of the solar wind. Comparison of data from the two spacecraft is used to separate temporal from spatial variations. The average bulk speed is found to remain constant at about 430 km/s, with stream structure still evident, though of diminished amplitude, at 20.5 AU (Pioneer 10's distance by the end of 1979). Proton density, flux, pressure, and kinetic energy flux are found to have radial profiles consistent with 1/R-squared. Proton temperatures decrease as R to the -0.6 power, too slowly for an adiabatic expansion.

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