Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh23a1138l&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH23A-1138
Physics
7514 Energetic Particles (2114), 7524 Magnetic Fields, 7859 Transport Processes, 7863 Turbulence (4490), 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
In previous studies, particle transport in the inner heliosphere is regarded as one dimensional along the archimedian spiral; any perpendicular transport is neglected. We extend Roelof's equation of focused transport to accommodate perpendicular transport in the plane of ecliptic. Numerically, this additional term is solved with the implicit Laasonen scheme for azimuthal instead of perpendicular transport - which is identical in the inner heliosphere where the archimedian field is almost radial. For typical ratios λ\|/λ\perp perpendicular transport close to the Sun is unreasonably strong. For a ratio scaled with a spiral angle dependent function we find that (a) azimuthal spread over some ten degrees occurs within a few hours, (b) the variation of maximum intensities with longitude is comparable to the ones inferred from multi-spacecraft observations, and (c) on a given field line intensity- and anisotropy-time profiles are modified such that fits with the 2D transport model give different combinations of injection profiles and mean free paths.
Kallenrode M.
Lampa F.
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