Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh61b06g&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH61B-06
Astronomy and Astrophysics
Astrophysics
2104 Cosmic Rays, 2118 Energetic Particles, Solar, 7514 Energetic Particles (2114), 7524 Magnetic Fields, 7867 Wave/Particle Interactions
Scientific paper
We discuss new results from analysis and modeling of the propagation of solar energetic particles to high heliographic latitudes. We consider both localized energetic-particles sources, such as those associated with impulsive solar flares, and large-scale sources associated with interplanetary shocks formed by coronal mass ejections. In our model, the footpoints of the heliospheric magnetic field move stochastically at the source surface with characteristic speeds and time scales consistent with those of solar supergranulation. We follow the trajectories of a large number of test particles in the resulting magnetic field which consists of large-scale turbulence. We find that the particles readily propagate in latitude due to the combination of transfering from one field line to the next and the spatial meandering of the magnetic field lines themselves. We will compare our results with recent Ulysses/COSPIN observations of high-energy (> 10 MeV) particles observed when Ulysses was at high southern solar latitudes (> 60o). When solar energetic particles are seen over a time comparable to the particle scattering time, non-diffusive behavior may result. This was discussed by Mazur et al.~(Astrophs.~J.~Lett., 532, L79, 2000) and Giacalone et al.~(Astrophs.~J.~Lett., 532, L75, 2000) who interpreted ACE/ULEIS observations of fine-scale intensity variations in impulsive-flare events as resulting from the passage of alternatively filled and empty flux tubes passed the spacecraft. The low-energy impulsive flare event observations at 1 AU by ACE, and the gradual SEP events observed at high heliographic latitude by Ulysses are related and provide information on the large-scale heliospheric magnetic field.
Giacalone Joe
Jokipii Randy J.
Zhang Minghui
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