Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.1557m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Feb. 1, 1992, p. 1557-1570.
Physics
80
Cosmic Rays, Heliosphere, Solar Activity, Galactic Radiation, Interplanetary Magnetic Fields, Interstellar Magnetic Fields, Magnetic Rigidity
Scientific paper
Cosmic ray observations at 1 AU are compared for the last three solar minimum periods along with the 1977/1989 and 1987 Pioneer 10 and Voyager 1 and 2 data from the outer heliosphere. There is good agreement between the 1965 and 1987 Galactic cosmic ray H and He spectra at 1 AU. Significant and complex differences are found between the 1977/1978 and 1987 measurements of the Galactic and anomalous cosmic ray components at 1 and 15 AU. In the outer heliosphere there are negative latitudinal gradients that reach their maximum magnitude when the inclination of the outer heliosphere current sheet is at a minimum. The radial gradients decrease with heliocentric distance as about 1/r exp 0.7 and do not differ significantly at the successive solar minima. The measured radial and latitudinal gradients are used to estimate the particle transport parameters in the outer heliosphere. Using the local interstellar He spectrum of Webber et al. (1987), it is estimated that the modulation boundary is of the order of 160 AU.
Lal Nand
McDonald Frank B.
McGuire Robert. E.
Moraal Harm
Reinecke P. L. J.
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