Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published 2001 | Published
Book Section - Chapter Open

Average Elemental and Isotopic Composition of Small Solar Energetic Particle Events


Using the Solar Isotope Spectrometer on the Advanced Composition Explorer, we have measured the heavy (Z≥6) element abundances of 33 small solar energetic particle (SEP) events which occurred between 4 April, 1998 and 3 December, 2000. The events have been classified according to their elemental and isotopic composition as well as other defining characteristics. With the event-averaged heavy element fluxes, we have investigated the dependence of elemental abundances relative to those of the solar photosphere on first ionization potential (FIP). Where possible, we have examined the FIP fractionation effects on the average composition of the small SEP events, and discuss the ensuing implications for the origin and acceleration of nuclei in these events.

Additional Information

© Copernicus Gesellschaft 2001. This research was supported by NASA at Caltech (under grant NAG5-6912), JPL, and GSFC. We thank the EPAM science team for providing the proton fluxes used to define the time periods of low solar activity in this paper.

Attached Files

Published - 2001-45.pdf


Files (2.8 MB)
Name Size Download all
2.8 MB Preview Download

Additional details

August 19, 2023
October 20, 2023