| タイトル | Elemental Abundance Variations Observed in Solar Energetic Particle Events During Solar Cycle 23 |
| 著者（英） | Stone, E. C.; Leske, R. A.; Cummings, A. C.; Cohen, C. M. S.; Mewaldt, R. A.; vonRosenvinge, T. T.; Widenbeck, M. E. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2004-01-01 |
| 言語 | eng |
| 内容記述 | We report on observations of the abundances of elements from Helium to Nickel in over 50 different solar energetic particle events using the Solar Isotope Spectrometer (SIS) on-board the Advanced Composition Explorer (ACE) spacecraft. It had originally been expected that the energy spectra of different elements would show spectral roll-overs at energies related to the Q/M ratio of each element. Due to the partial stripping of Fe and essentially complete stripping of O, it was expected that the Fe/O ratio would be observed to decrease with increasing energy. While many events show this pattern, others have Fe/O which is constant with energy, while for yet others Fe/O actually increases with energy. Events having constant Fe/O could simply have their spectral breaks outside of the observed energy range. However, events which show increasing Fe/O cannot be explained within the framework of spectral breaks. Possible explanations include injection of remnant heavy ions from earlier impulsive events, hybrid Events consisting of a combination of flare-accelerated and shock-accelerated particles from a single solar event, and some new physical process in shock acceleration. We will report on efforts to distinguish these possible explanations. |
| NASA分類 | Solar Physics |
| 権利 | No Copyright |
|
