Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 106, Issue A11, Pages 25333-25352Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2000JA004028
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Solar energetic particle (SEP) events are occasional bursts of high-energy particles from the Sun. Because of their episodic, highly variable, and (presently) unpredictable nature, these events are one of the primary constraints on the technological utilization of space and in the design and operation of space systems. New instruments on Wind and ACE, with geometry factors that are similar to 100 times larger than those of previous solar cycles, have yielded unprecedented observations of temporal evolution in composition and spectra over a wide range of energies and species. These new results address some of the key physics that governs SEP production. Of particular importance in very large SEP events are transport effects due to proton-generated Alfven waves and the evolving nature of the coronal mass ejection driven shock.
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