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Webber & Lockwood 1995
Webber, W.R. and Lockwood, J.A. (1995). Intensity variations of >70-Mev cosmic rays measured by Pioneer 10, Voyager 1 & 2 and IMP in the heliosphere during the recovery period from 1992–1995. Geophysical Research Letters 22: doi: 10.1029/95GL02636. issn: 0094-8276.

Using data from the 70-MeV particles reported recently in the inner heliosphere but quite different from the positive gradients observed at this time throughout the heliosphere by the Ulysses and Voyager spacecraft for anomalous cosmic rays.

Overall the cosmic ray intensity is almost uniform in radius, azimuth,and latitude at this time in the outer heliosphere - and far lower than the estimated interstellar intensity. The intensities are, in fact, much lower than would be expected based on data from the previous cycle. This, along with the very slow increase that is observed, suggests that, at the same radial distance, the intensity in 1977 will be much less than in the previous cycle in 1987 - resulting in a large 22-year modulation wave. The data show some features which suggest that large scale drift patterns, which change when the solar magnetic polarity changes every 11 years, play a important role in the overall intensity distribution in the outer heliosphere - but specific details, particularly in the present positive polarity cycle begining in 1990 are not well predicted by current models. ¿ American Geophysical Union 1995.

BACKGROUND DATA FILES

Abstract

Keywords
Interplanetary Physics, Cosmic rays, Interplanetary Physics, Heliopause and solar wind termination
Journal
Geophysical Research Letters
http://www.agu.org/journals/gl/
Publisher
American Geophysical Union
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