Radial evolution of the solar wind from IMP 8 to Voyager 2

Details Radial evolution of the solar wind from IMP 8 to Voyager 2 Radial evolution of the solar wind from IMP 8 to Voyager 2

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..325r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 4, p. 325-328

Physics

78

Plasma Density, Plasma Temperature, Radial Velocity, Solar Cycles, Solar Flux Density, Solar Rotation, Solar Wind, Explorer 50 Satellite, Velocity Measurement, Voyager 2 Spacecraft

Scientific paper

Voyager 2 and Interplanetary Monitoring Platform (IMP) 8 data from 1977 through 1994 are presented and compared. Radial velocity and temperature structures remain intact over the distance from 1 to 43 AU, but density structures do not. Temperature and velocity changes are correlated and nearly in phase at 1 AU, but in the outer heliosphere temperature changes lead velocity changes by tens of days. Solar cycle variations are detected by both spacecraft, with minima in flux density and dynamic pressure near solar maxima. Differences between Voyager 2 and IMP 8 observations near the solar minimum in 1986-1987 are attributed to latitudinal gradients in solar wind properties. Solar rotation variations are often present even at 40 AU. The Voyager 2 temperature profile is best fit with a R-0.49 +/- 0.01 decrease, much less steep than an adiabatic profile.

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