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Initial Time Dependence of Abundances in Solar Energetic Particle Events
- Publication Year :
- 1999
- Publisher :
- United States: NASA Center for Aerospace Information (CASI), 1999.
-
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. (1999a, b). He/H ratios that initially rise with time are a signature of scattering by non-Kolmogorov Alfven wave spectra generated by intense beams of shock-accelerated protons streaming outward in large gradual SEP events.
- Subjects :
- Solar Physics
Subjects
Details
- Language :
- English
- Database :
- NASA Technical Reports
- Notes :
- NASA Order S-92662-F
- Publication Type :
- Report
- Accession number :
- edsnas.20000034248
- Document Type :
- Report