Paper presented at the 31st ESLAB Symposium, 22-25 September 1997, ESTEC, Noordwijk, The Netherlands
The CELIAS instrument onboard the SOHO satellite is designed to study the ionic, elemental, and isotopic composition of solar wind ions and of solar energetic particles. With the MTOF sensor (Mass Time-of-Flight) of the CELIAS instrument we can measure the elemental and isotopic composition in the main energy range of the solar wind (slow and fast) with high mass and time resolution. We will present data of the elemental abundance of oxygen, silicon, and iron solar wind ions. These three elements span almost the full mass range of the minor ions in the solar wind. Furthermore, this selection contains low and high ionization potential elements (13.61, 8.15, and 7.87eV, respectively), allowing for a detailed study of abundance variations depending on the type of the solar wind.