Initial Time Dependence of Abundances in Solar Energetic Particle Events
Abstract
We compare the initial behavior of Fe/O and He/H abundance ratios and their relationship to the evolution of the proton energy spectra in ``small'' and ``large'' gradual solar energetic particle (SEP) events. The results are qualitatively consistent with the behavior predicted by the theory of Ng et al. published in 1999. He/H ratios that initially rise with time are a signature of scattering by non-Kolmogorov Alfvén wave spectra generated by intense beams of shock-accelerated protons streaming outward in large gradual SEP events.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 2000
- DOI:
- 10.1086/312517
- Bibcode:
- 2000ApJ...531L..83R
- Keywords:
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- ACCELERATION OF PARTICLES;
- SHOCK WAVES;
- SUN: CORONA;
- SUN: PARTICLE EMISSION