The Transport of Anomalous Cosmic Rays

Details The Transport of Anomalous Cosmic Rays The Transport of Anomalous Cosmic Rays

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh71a..05s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH71A-05

Physics

2114 Energetic Particles, Heliospheric (7514), 2162 Solar Cycle Variations (7536)

Scientific paper

The gradients of anomalous cosmic rays provide a measure of the rigidity dependence of the diffusive radial mean free path. During period of negative solar magnetic polarity and minimum solar activity, the gradients are small when the current sheet is flat and increase with increasing current sheet tilt. For positive polarity, the gradients during solar minimum are small and independent of tilt for tilts up to about 50 degrees, suggesting that drifts map mid-latitude gradients to lower latitudes. Mean free paths at 1.5 GV during solar minimum beyond 50 AU are larger than 1 AU and increase linearly with radius as expected at higher latitudes in the absence of stream driven turbulence. During solar maximum, the gradients are much larger, corresponding to a factor of ten reduction in mean free path. This large decrease may be associated with the inhibition of drifts and the presence of increased stream driven turbulence at higher latitudes. This work was supported by NASA under contract NAS7-1407.

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