Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....9012027b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Dec. 1, 1985, p. 12,027-12,039. Previously announced in STAR as N85-2
Physics
120
Cosmic Rays, Magnetic Fields, Magnetohydrodynamic Turbulence, Modulation, Plasma Interactions, Voyager 2 Spacecraft, Nucleons, Shock Waves, Solar Activity
Scientific paper
When Voyager 2 was near 11 AU, the counting rate of nuclei approx 75 MeV/nucleon decreased during the interval from July, 1982 to November, 1982, and it increased thereafter until August, 1983. A decrease in cosmic ray flux was generally associated with the passage of an interaction region in which the magnetic field strength B was higher than that predicted by the spiral field model, Bp. Several large enhancements in B/Bp were associated with merged interaction regions which probably resulted from the interaction of two or more distinct flows. During the passage of interaction regions the cosmic ray intensity decreased at a rate proportional to (B/Bp -1), and during the passage of rarefaction regions (where B/Bp 1) the cosmic ray intensity increased at a constant rate. The general form of the cosmic ray intensity profile during this approx 13 month minicycle can be described by integrating these relations using the observed B(+). Latitudinal variations of the interaction regions and of the short-term cosmic ray variations were identified.
Burlaga Leonard Francis
Goldstein Michel L.
Lazarus Andrew J.
McDonald Frank B.
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