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| Titel |
Perpendicular Transport in the Inner Heliosphere |
| VerfasserIn |
F. Lampa, M.-B. Kallenrode |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019347
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| Zusammenfassung |
| In previous studies, transport of solar energetic particles in the inner heliosphere has been
regarded as one dimensional along the archimedian field spiral; any perpendicular transport is
neglected. We have extended Ruffolo’s equation of focused transport for solar energetic
particles to accommodate perpendicular transport in the plane of ecliptic. Numerically, this
additional term is solved with the implicit and stable Laasonen scheme. For typical
ratios κ⊥∕κ∥ between 0.02 and 0.1 at 1 AU as suggested in non linear guiding
center theory and a scaling of κ⊥ with r2 as suggested from the random walk of
field lines 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.
Implications for the interpretation of intensity and anisotropy time profiles observed in
interplanetary space and consequences for our understanding of particle propagation and
acceleration in space will be discussed. We will also address the question whether and how
the modeling of flux dropouts and propagation channels is possible in the presence of
perpendicular diffusion as the ultimate leveler. |
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