- Measure the enhancements of trans-iron elements in impulsive SEPs (Mason et al., 2004, Reames et al., 2000). Correlate these properties with other properties of the events close to the Sun where their peak intensities are higher.
Puzzling extreme enrichments of rare trans-iron elements (Z = 30 to 83) have been reported in impulsive events (Reames 2000; Reames and Ng 2004). In some events trans-iron nuclei are enriched by ~10,000 with respect to oxygen. These results extend the range of particle mass (and rigidity) over which injection and acceleration models must apply. Although progress has been made in modeling 3He spectra using wave-particle interactions [e.g., Roth and Temerin 1997; Miller, 1998; Liu, et al., 2004], no single model yet addresses the combination of 3He-enrichment, heavy-ion enrichments, and the charge-state and electron associations in these events. Trans-iron enrichments have been reported at energies up to ~30 MeV/nuc (Leske et al. 2007).
YZ: Confirm that we can still do this with SIS, after LET descoping.
- EPD: All sensors: spectra, composition, fluxes, directional information, together with IS instruments. Solar source identification by RS instruments (full disk imaging). Also coordinated multi-s/c SEP observation campaigns with SPP & other missions.
Normal IS mode should be enough. We don't necessarily need a RS window (for this specific objective), however it would be great if we can identify the solar source as for all Obj. 3.