Injection and interplanetary propagation of solar energetic particles observed on ACE

Details Injection and interplanetary propagation of solar energetic particles observed on ACE Injection and interplanetary propagation of solar energetic particles observed on ACE

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsh43b..01m&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH43B-01

Physics

7519 Flares, 7845 Particle Acceleration, 7859 Transport Processes, 7867 Wave/Particle Interactions (2483, 6984), 2101 Coronal Mass Ejections (7513)

Scientific paper

It has been long known that for many large solar energetic particle (LSEP) events, the release of energetic ions is delayed from the presumed initiating activity at the Sun. In early interpretations, this delay was attributed to "coronal storage", perhaps followed by diffusive transport in the interplanetary medium. The more recent linkage of LSEP events to shocks associated with Coronal Mass Ejections (CMEs) opened the possibility of a different interpretation wherein the delay was produced by the multi-hour time scale over which the shock accelerated particles as it moved out from the Sun. Simple models using either interpretation can successfully fit some of the observed events. Distinguishing between these and related scenarios is critical to understanding the actual mechanisms operating in these events, so that they may be tested against realistic models. This is not straightforward since acceleration and transport effects between the Sun and 1 AU blur much of the information. The ACE spacecraft, with its comprehensive ion and electron observations, allows us take a new look at this problem to see if we can use broad observations to identify specific mechanisms operating in LSEP events. We have examined 14 events for which parent activity is in the Western hemisphere or just over the West limb, in order to minimize the complexities of magnetic connection to the flare site. Using ions over a broad energy range (0.1 to 10s of MeV/n) and relativistic electrons, we combine time-intensity profiles with anisotropy information in order to constrain the acceleration and transport mechanisms as much as possible. As might be expected, we find that there is no single scenario that operates in all these events, and indeed even within a single event there is sometimes a significant difference in behavior between the high and low energy ions.

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