Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh44c..05p&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH44C-05
Physics
7513 Coronal Mass Ejections (2101), 7514 Energetic Particles (2114), 7519 Flares, 7859 Transport Processes
Scientific paper
New observations by high-sensitivity instruments onboard the ACE spacecraft show that Fe and O may share similar injection profiles close the solar surface, and that diffusion dominates the transport of these particles (Mason et al 2006). Multi-spacecraft observations by Helios and IMP-8 also confirm the spatial diffusion is important (Wibberenz & Cane 2006). The "reservoir" phenomenon or "spatial invariance" states that during the decay phase of individual gradual solar energetic particle events, the intensities measured by different spacecraft are nearly equal, even if these spacecraft are separated by several AU in radius and by 70 degrees in latitude. Results from our multidimensional numerical model, based on Parker's transport equation, with reasonable values of κ\perp and κ\| are compared with observations from Ulysses, IMP-8, and ACE. We demonstrate that most of the features of the "reservoir" phenomenon can be reproduced by a transport model which includes drift, energy loss, and spatial diffusion.
Giacalone Joe
Jokipii J.
Pei Chang-xing
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