Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249l..71m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 249, Oct. 15, 1981, p. L71-L75.
Astronomy and Astrophysics
Astronomy
93
Cosmic Rays, Galactic Radiation, Heliosphere, Interplanetary Medium, Solar Activity Effects, Energy Spectra, Helios 1, Helios 2, Helium, Modulation, Pioneer 10 Space Probe, Shock Wave Propagation, Spaceborne Astronomy
Scientific paper
The intensity changes of galactic cosmic rays associated with the enhanced solar activity during the onset of cycle 21 were observed by Pioneer 10 and Helios 1 and 2, over an extended range of energy and heliocentric distance that provides new insight into the relative importance of the various processes involved in the long-term modulation. A close correspondence is found between changes at 1 AU and those at 23 AU, for hydrogen and helium in the range of 100-200 MeV per nucleon. The time delay observed corresponds to an outward propagation velocity of some 550 km/sec, suggesting that the recently discovered, moderately long-lived, radially propagating shock waves in the outer heliosphere may play a key role in the long-term modulation.
Lal Niranjan
McDonald Frank B.
Trainor James H.
Van Hollebeke A. I. M.
Webber William R.
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