Estimates of solar wind velocity gradients between 0.3 and 1 AU based on velocity probability distributions from HELIOS 1 at perihelion and aphelion

Details Estimates of solar wind velocity gradients between 0.3 and 1 AU based on velocity probability distributions from HELIOS 1 at perihelion and aphelion Estimates of solar wind velocity gradients between 0.3 and 1 AU based on velocity probability distributions from HELIOS 1 at perihelion and aphelion

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9614183a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Aug. 1, 1991, p. 14,183-14,187.

Mathematics

Probability

10

Aphelions, Perihelions, Probability Distribution Functions, Solar Wind Velocity, Helios A, Velocity Distribution

Scientific paper

The average velocity gradients for the solar wind protons were estimated by comparing the velocity probability distributions at 0.3 and at 1 AU. Assuming a power law radial dependence, it was found that, for a full 6-year data set, the gradients for the lowest velocity ranges are about R exp 0.1 to R exp 0.14 and that the power index decreases steadily with increasing velocity until the slope is near zero for the high-speed solar wind. However, upon examining the solar-cycle dependence, it is found that this trend for the velocity gradient to decrease with increasing velocity is a characteristic primarily of the increasing solar activity and solar maximum period and is almost absent in the solar minimum data. The solar wind above 500 km/s during solar minimum shows an average acceleration similar to the slow wind, about 55 to 85 km/s/AU. On the other hand, winds above 350 km/s from the period of increasing solar activity and solar maximum show essentially no average acceleration beyond 0.3 AU.

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