Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh34a..04q&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SH34A-04
Physics
Plasma Physics
[7514] Solar Physics, Astrophysics, And Astronomy / Energetic Particles, [7807] Space Plasma Physics / Charged Particle Motion And Acceleration, [7845] Space Plasma Physics / Particle Acceleration, [7851] Space Plasma Physics / Shock Waves
Scientific paper
It has been known for many years that in most gradual solar energetic particle (SEP) events, the particle energy spectra remain roughly the same shape throughout the decay phase and in the meantime the intensities of SEP reach a nearly uniform level everywhere in the inner heliosphere as if there were a reservoir of particles that is drained slowly. This spatial and temporal SEP spectral invariance is a feature closely related to SEP reservoir phenomenon. It is usually considered to be caused by particle confinement through a strong magnetic field disturbance or a particle diffusion barrier left behind by interplanetary coronal mass ejections (ICMEs), although in many cases the ICME is not directly observed by the spacecraft and the spatial invariance in the energetic particle spectral can form at large distance of up to 3 AU long before the ICME can possibly reach. In this paper, we offer a different interpretation for the formation of SEP reservoir. The model involves an ICME shock as a moving SEP source, but the enhancement of magnetic field disturbance behind the shock is ignored. We compute the intensity time profiles of SEP propagating in the 3-dimensional Parker field with a normal turbulence level. With this model our comparisons of SEP spectra at different locations in the inner heliosphere show that the spatial and temporal invariance in the SEP spectra in gradual events can be reproduced without a diffusion barrier.
Qin Gan
Wang Yadong
Zhang Minghui
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