What new Observations Will Advance Our Understanding of the Origin of Solar-Energetic Particles?

Details What new Observations Will Advance Our Understanding of the Origin of Solar-Energetic Particles? What new Observations Will Advance Our Understanding of the Origin of Solar-Energetic Particles?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh54a..01g&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH54A-01

Physics

2101 Coronal Mass Ejections (7513), 2114 Energetic Particles (7514), 2134 Interplanetary Magnetic Fields

Scientific paper

The origin of solar-energetic particles (SEPs) remains one of the most important unsolved problems in solar and heliospheric physics. A major challenge facing theorists and observers is that the intensity, spectra, composition, and anisotropies of SEPs observed at 1AU is a combination of various particle sources, propagation effects, and acceleration at remote sites. While energetic particles themselves are valuable probes of regions of space inaccessible to spacecraft, determining their past histories can be difficult, especially for the large SEP events. New efforts using integrated large-scale modeling (MHD + particle-transport) are underway and are yielding promising results. However, there are still many uncertainties including the boundary conditions, particle-transport parameters, and the role of turbulence. New observations will greatly help us to clarify the physics and help us understand the evolution of SEP distributions in space. These include STEREO, which will provide multi-point measurements over a wide range of solar longitudes, and Inner-Heliospheric Sentinels, which will make observations closer to the Sun (and nearer to the acceleration site), and also provide good longitudinal coverage. In this talk, I will provide a theoretical perspective on which observations are needed to advance our understanding of the origin of SEPs. I will also discuss some current theories that will be put to the test by these observations.

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