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Published 2003 | Published
Book Section - Chapter Open

The Solar Cycle Variability of Solar Energetic Particle Composition


Solar particle isotopic composition varies greatly from event to event, apparently due to mass fractionation during particle acceleration and/or transport. We examine whether the amount of this variability changes during the solar cycle and find a strong indication of less isotopic compositional variability at solar maximum than during less active phases. There also seems to be a similar but weaker association using elemental abundances. The underlying cause of the variability and reasons why it might change over the solar cycle are yet to be determined.

Additional Information

Copyright Universal Academy Press Inc. This work was funded by NASA at Caltech (under grants NAG5-6912 and NAG5-12929), JPL, and the Goddard Space Flight Center. HCS tilt angles were obtained from the Wilcox Solar Observatory web site.

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August 19, 2023
October 23, 2023