| タイトル | Interplanetary Shocks and "Suprathermal" Flare Particles |
| 著者（英） | Cane, H. V.; Richardson, I. G.; vonRosenvinge, T. T. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2006-01-01 |
| 言語 | eng |
| 内容記述 | We use ion-composition data from ACE/ULEIS, low energy electrons from ACE/EPAM, high energy protons from SoHO/ERNE, radio data from Wind/WAVES, and solar wind data from ACE/SWEPAM and ACE/MAG to investigate the solar and interplanetary circumstances near the times of passage of near-Earth shocks. We are particularly interested in claims that local acceleration by some interplanetary shocks produces Fe/O > 0.3 ('Fe-rich' shocks). The choice of the specific interval used to calculate the Fe/O ratio is extremely important because shock-accelerated particles can be masked by particles from flare events, related or unrelated to the shock, that have Fe/O > 0.3. We conclude that shock- accelerated populations have Fe/0<0.3. We illustrate 5 events which have been reported to be Fe-rich and for which Fe/O increases with energy in the 0.5-2 MeV/nuc range. We find that in each case there are direct flare particles included in the averaging time interval. We also demonstrate that the Fe/O ratio increases as a result of the averaging time interval being too large. |
| NASA分類 | Astrophysics |
| 権利 | Copyright |
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