Interplanetary cosmic-ray radial and latitudinal gradients derived in 1984 using IMP 8, Voyager, and Pioneer data

Details Interplanetary cosmic-ray radial and latitudinal gradients derived in 1984 using IMP 8, Voyager, and Pioneer data Interplanetary cosmic-ray radial and latitudinal gradients derived in 1984 using IMP 8, Voyager, and Pioneer data

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...302..511w&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 302, March 1, 1986, p. 511-516.

Computer Science

Sound

16

Cosmic Rays, Interplanetary Medium, Satellite Sounding, Explorer 50 Satellite, Heliosphere, Particle Flux Density, Pioneer 10 Space Probe, Radial Distribution, Voyager 2 Spacecraft

Scientific paper

We have examined the interplanetary cosmic-ray radial and latitudinal gradients during a period of relatively stable cosmic-ray intensity in 1984 when the intensity was recovering from the minimum in solar cycle 21. Data from cosmic-ray telescopes on IMP 8, Voyager 2, and Pioneer 10, all essentially in the ecliptic plane, and Voyager 1 at an average heliographic latitude ˜24°, are used. During this time period, cosmic-ray temporal variations seem to be propagating outward at a velocity of ˜600 km s-1. Correcting the data at different radii for this time delay leads to average integral radial gradients of 2.23% AU-1 using Voyager 2 and IMP 8 (average radial separation = 13.5 AU) and 1.77% AU-1 using Pioneer 10 and IMP 8 (average radial separation = 33.0 AU). These gradients are less than the average 2.8% AU-1 gradient observed during the decreasing part of the solar cycle between 1977 and t982 and are also a function of radius, in contrast to the earlier period. The Voyager 1 intensity is ˜1% lower than that to be expected at its radial distance of 20.2 AU in the ecliptic plane based on the Voyager 2 and Pioneer 10 gradients. This leads to a small average latitudinal gradient of about -0.04% deg-1, basically consistent with zero over the heliographic latitude range 0°-24°.

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