| タイトル | A deficiency of O III in the Io plasma torus |
| 著者（英） | Johnson, R. E.; Brown, R. A.; Shemansky, D. E. |
| 著者所属（英） | Arizona Univ.|Virginia Univ. |
| 発行日 | 1983-01-01 |
| 言語 | eng |
| 内容記述 | Evidence for a deficiency of O III ions in the Io plasma torus is reported and implications of this deficiency for the physical processes controlling the plasma are considered. Observations of the O III 5007-A as well as Cl III and S III emissions from the Io plasma torus were made by a ground-based echelle spectrograph and intensified Reticon detector in February and May, 1981. The O III observations allow an upper limit of 4/cu cm to be placed on torus O III abundance, which is inconsistent with expectations for a low density plasma controlled by electron collisions. The inclusion of ion-ion and ion-atom charge exchange reactions and a depleted high energy electron component in the model is found to suppress O III levels, however observed limiting values are only achieved if it is assumed that the O III is kinetically hot. In addition, the charge-exchange model developed is inconsistent with previous observations of the kinetics of the S II-S III system. The present observations also establish upper limits of 2 R on 5518-A and 5538-A Cl III emission, and an emission rate of 58 + or - 40 R for the S III 6312-A line in the hot torus. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 83A19296 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/405853 |
|
