McGrath M A, Hall D T, Matheson P L, Weaver H A, Trauger J T, Smith T E, Thomas N, Gladstone R, Schneider N M, Harris W M
Space Telescope Science Institute, Baltimore, MD 21218.
Science. 1995 Mar 3;267(5202):1313-7. doi: 10.1126/science.7871429.
Spectroscopic and imaging observations of the Io plasma torus were made in June and July 1994 in conjunction with the encounter of periodic comet Shoemaker-Levy 9 with Jupiter. Characteristic emissions from sulfur and oxygen ions showed a decline of about 30 percent in the extreme ultraviolet and an increase of about 40 percent in the far ultraviolet relative to preimpact observations. Changes in the extreme ultraviolet may be indicative of small changes in the torus electron temperature as a result of quenching of electrons by dust associated with the comet passage. However, no new emission features indicative of fragment dust within the torus were detected. The characteristic torus morphology seen in ground-based imaging was typical of that observed in the past.
1994年6月和7月，在周期性彗星苏梅克-列维9号与木星相遇期间，对木卫一等离子体环进行了光谱和成像观测。与撞击前的观测相比，硫离子和氧离子的特征发射在极紫外波段下降了约30%，在远紫外波段增加了约40%。极紫外波段的变化可能表明，由于彗星通过时尘埃对电子的猝灭作用，环内电子温度发生了微小变化。然而，未检测到表明环内存在碎片尘埃的新发射特征。地基成像中看到的典型环形态与过去观测到的相似。
