AURORAL OXYGEN PRECIPITATION AT JUPITER
AURORAL OXYGEN PRECIPITATION AT JUPITER
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DOI：
10.1029/95ja00970
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发表时间：
1995-09-01
影响因子：
2.8
通讯作者：
GLADSTONE, GR
中科院分区：
文献类型：
--
作者：
CRAVENS, TE;HOWELL, E;GLADSTONE, GR
木星的极光比地球上的极光强大得多，一些非地球能量的沉积被认为来自高能氧和硫的沉淀。非道德的氧和硫离子通过电离、解离和加热过程将它们的能量储存在大气中。以前在木星上的高能氧沉淀是用最低的四种电荷态(0,0（+),0（2+）和0(3+)）来建模的（Horanyi et al., 1988），在本文中，该模型将扩展到包括从中性氧到完全剥离氧的所有氧的电荷态。能量超过200 keV/amu的入射离子的能量沉积在很大程度上取决于较高的电荷态。研究高能高电荷离子的极光X射线发射也需要模型扩展，本文估计高电荷激发氧离子产生的极光X射线总功率约为10(8)W，这与Rontgen卫星在木星观测到的X射线功率一致（ROSAT; Waite et al., 1994）。我们还建立了一个“预测”的硫离子和氧离子的X射线能谱，它与ROSAT测量的能谱吻合得很好。我们的计算支持Waite et al.（1994）的断言，即ROSAT观测到的木星X射线发射可以用高能离子沉淀来解释。
The Jovian aurora is much more powerful than the terrestrial aurora, and some of the amoral energy deposition is thought to come from energetic oxygen and sulfur precipitation. Amoral oxygen and sulfur ions deposit their energy in the atmosphere by means of ionization, dissociation, and heating processes. Energetic oxygen precipitation at Jupiter was previously modeled with the lowest four charge states (0, 0(+), 0(2+), and 0(3+)) (Horanyi et al., 1988), In this paper, the model will be extended to include all the charge states of oxygen from neutral oxygen up to fully stripped oxygen. The energy deposition by incident ions with energies in excess of about 200 keV/amu is largely determined by the higher charge states. The model extension is also needed to study auroral X ray emission by energetic highly charged ions, In this paper we estimate that a total auroral X ray power of about 10(8) W is produced by highly charged excited oxygen ions, which is in agreement with the X ray power observed at Jupiter by the Rontgen satellite (ROSAT; Waite et al., 1994). We also construct a ''predicted'' X ray energy spectrum fbr sulfur and oxygen ions which agrees rather well with the spectrum measured by ROSAT. Our calculations support the assertion made by Waite et al. (1994) that the Jovian X ray emission observed by ROSAT can be explained by energetic ion precipitation.