Interplanetary discontinuities - Temporal variations and the radial gradient from 1 to 8.5 AU

Details Interplanetary discontinuities - Temporal variations and the radial gradient from 1 to 8.5 AU Interplanetary discontinuities - Temporal variations and the radial gradient from 1 to 8.5 AU

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2773t&link_type=abstract

Journal of Geophysical Research, vol. 84, June 1, 1979, p. 2773-2787.

Physics

37

Interplanetary Magnetic Fields, Nonuniform Plasmas, Radial Distribution, Solar System, Discontinuity, Magnetometers, Pioneer Space Probes, Solar Rotation, Time Response

Scientific paper

A dependence of the rate of occurrence and properties of interplanetary discontinuities on radial distance were investigated using Pioneer 10 and 11 vector helium magnetometer observations. Spatial and temporal variations were separated and discontinuities identified, noting that their rate of occurrence undergoes large variations well outside the deviations expected from statistical fluctuations. Temporal changes in the occurrence rate averaged over Bartels solar rotations were well correlated at Pioneer 10 and 11, separated by a distance of 2 AU, and time variations consisted of slow modulation of the occurrence rate due to changing solar conditions. The correlation over widely separated distances is interpreted by a model in which the discontinuities originate inside 1 AU and are convected outward by the solar wind. Evidence of spatial dependence was provided by a decrease in the rates of occurrence at both spacecraft with increasing radial distance, and it was shown that the Pioneer 11 rate, nearer the sun, exceeded the Pioneer 10 rate at greater distances.

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