Voyager observations of solar wind proton temperature - 1-10 AU

Details Voyager observations of solar wind proton temperature - 1-10 AU Voyager observations of solar wind proton temperature - 1-10 AU

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..431g&link_type=abstract

Geophysical Research Letters, vol. 9, Apr. 1982, p. 431-434.

Physics

34

Proton Energy, Solar Protons, Solar Wind, Distance, Temperature Gradients, Temperature Measurement, Voyager 1 Spacecraft, Voyager 2 Spacecraft

Scientific paper

Simultaneous measurements are made of the solar wind proton temperatures by the Voyager 1 and 2 spacecraft, far from earth, and the IMP 8 spacecraft in earth orbit. This technique permits a separation of radial and temporal variations of solar wind parameters. The average value of the proton temperature between 1 and 9 AU is observed to decrease as r (the heliocentric radius) to the -(0.7 + or - 0.2). This is slower than would be expected for adiabatic expansion. A detailed examination of the solar wind stream structure shows that considerable heating occurs at the interface between high and low speed streams.

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