Physics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2203c&link_type=abstract
Journal of Geophysical Research, vol. 87, Apr. 1, 1982, p. 2203-2214.
Physics
29
Radial Distribution, Solar Wind Velocity, Velocity Distribution, Correlation Coefficients, Histograms, Imp, Pioneer Space Probes, Standard Deviation
Scientific paper
Pioneer 10 and 11 solar wind speeds measured between 1.4 and 15.2 AU are compared with those of IMP 6, 7, and 8 measured at 1 AU for 90-day intervals centered on six solar radial alignments between 1973 and 1978. The time profile of the solar wind speed undergoes change as the distance from the sun increases, which is due to interaction of adjacent solar wind streams. Speed variations are smaller at greater radial distance and both the highest and lowest speeds disappear as radial distance increases. For periods with extremely high speed solar wind streams, the mean solar wind speed decreases as the distance from the sun increases, which must be due to the disappearance of the highest speeds of the streams with increasing distance. It is concluded that at distances from the sun greater than 30-40 AU, the solar wind behavior may closely resemble that of a radially expanding constant speed plasma.
Collard Harold R.
Mihalov John D.
Wolfe John H.
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