Solar Coronal Abundances of Rare Elements Based on Solar Energetic Particles
Although solar energetic particle (SEP) abundances vary from event to event, it has been shown that by accounting for these variations it is possible to use SEP data to obtain reliable estimates of elemental abundances for the solar corona. We analyze ~20 to 65 MeV/nucleon measurements from the Solar Isotope Spectrometer on ACE in large SEP events observed from November 1997 to January 2001 to obtain new values of the average SEP composition of rare species, P, Cl, K, Ti, Mn, Cr, Co, Cu, and Zn, which have had limited statistical accuracy in SEPs in the past. The measured SEP abundances are compared with other sources of solar-system composition data.
Additional Information© 2001 American Institute of Physics. Issue Date: 21 November 2001. This work was supported by NASA at Caltech (under grant NAG5-6912), Jet Propulsion Laboratory, and Goddard Space Flight Center.
Published - COHaipcp01b.pdf