Trans-Nickel Elements in Solar Energetic Particles
The trans-nickel elements (Z ≥ 29) are some of the rarest in the Solar System; they typically are about 1/1OOOth to l/lOOOOth as abundant as iron (Z = 26). We present measurements of zinc and other transnickel elements in solar energetic particle (SEP) events observed by the Solar Isotope Spectrometer (SIS) in the energy range of 10-75 MeV/nuc. SIS is part of the Advanced Composition Explorer (ACE) spacecraft, presently in orbit about the Earth-Sun Ll point. The measured abundances of the trans-nickel elements are compared to tabulated meteoritic and photospheric abundances and to previous SEP measurements. The results may help to assess changes in composition due to SEP acceleration and transport.
Additional Information© University of Utah. Provided by the NASA Astrophysics Data System. This work was supported by NASA under grant NAG5-6012 at the California Institute of Technology, the Jet Propulsion Laboratory, and the Goddard Space Flight Center.
Published - 1999-15.pdf