Estimate of cosmic-ray latitudinal gradient in 1981-1982

Details Estimate of cosmic-ray latitudinal gradient in 1981-1982 Estimate of cosmic-ray latitudinal gradient in 1981-1982

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278l.119d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 278, March 15, 1984, p. L119-L122.

Astronomy and Astrophysics

Astrophysics

16

Galactic Cosmic Rays, Interplanetary Medium, Radiation Measurement, Gradients, Voyager 1977 Mission

Scientific paper

Voyager 1 and 2 measurements of galactic cosmic ray proton gradients greater than 70 MeV over a period which coincides with the initial phase of cosmic ray recovery, following a minimum reached in late 1980-early 1981, are analyzed. The intensity difference between the two spacecraft, as they increase their heliolatitude separation from 3 to 16 deg, is consistent with either a positive radial gradient of about 2 percent/AU assuming zero heliolatitude gradient, or a small heliolatitude gradient of about 0.4 percent/degree, assuming zero helioradial gradient. If the radial gradient during the 1981-1982 recovery period remains at the 2-4 percent/AU level determined from multispacecraft measurements during the 1977-1980 decay period, then the heliolatitude gradient is negligible and may be accounted zero percent/deg over 16 deg heliolatitude separation in 8-13 AU.

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