Physics
Scientific paper
Feb 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.2105s&link_type=abstract
Journal of Geophysical Research, vol. 103, p. 2105
Physics
5
Solar Cosmic Rays, Particle Acceleration, Pioneer 10 Space Probe, Lyman Alpha Radiation, Solar Activity, Galactic Cosmic Rays, Interplanetary Flight, Cross Correlation, Time Dependence, Energetic Particles, Particle Diffusion, Spatial Distribution
Scientific paper
Cross correlations of solar Lyman-alpha and cosmic ray data from 1981 until 1990 recorded by instruments on Pioneer 10 during its interplanetary cruise are presented. Using the Lyman-alpha radiation as a proxy for long-term solar activity, a comparison of the correlation functions of the anomalous and Galactic cosmic ray data reveals a significantly greater phase shift in the time variation of the former. This additional time lag is increasing with increasing particle energy and is attributed to the time required to energize pickup ions at the heliospheric termination shock, and thus allows a determination of the characteristic acceleration time of anomalous cosmic rays. This, in turn, results in an estimate of the efficiency of the spatial diffusion of energetic particles perpendicular to the magnetic field just upstream of the heliospheric termination shock at low heliographic latitudes.
Fahr Hans Jörg
Fichtner Horst
Scherer Klaus
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