Jovian X‐ray emission from solar X‐ray scattering
Jovian X‐ray emission from solar X‐ray scattering
复制标题
太阳 X 射线散射产生的木星 X 射线发射
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
L. Acton
中科院分区：
文献类型：
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作者：
A. Maurellis;T. Cravens;G. Gladstone;J. Waite;L. Acton
在木星的赤道和极光区域都观测到了亮度约为 0.01-0.2 瑞利的软 X 射线发射。有人提出，赤道发射，就像极光发射一样，可能很大程度上是由于高能重离子沉淀到大气中造成的[Waite et al., 1997]。在本文中，我们模拟了低纬度X射线发射的两种替代机制：（1）大气中性物质对太阳X射线的弹性散射，（2）来自位于木星均层顶下方的甲烷分子的碳K壳层X射线的荧光散射。我们建模的亮度与大部分低纬度 ROSAT 测量结果一致，最多达两倍。这表明太阳光子散射（约 90% 弹性散射）可能与高能重离子沉淀一起作用，产生木星赤道 X 射线发射。
Soft x‐ray emissions with brightnesses of about 0.01–0.2 Rayleighs have been observed from both the equatorial and auroral regions of Jupiter. It has been proposed that the equatorial emission, like the auroral emission, may be largely due to precipitation of energetic heavy ions into the atmosphere [Waite et al., 1997]. In this paper we model two alternative mechanisms for low‐latitude x‐ray emission: (1) elastic scattering of solar x‐rays by atmospheric neutrals, (2) fluorescent scattering of carbon K‐shell x‐rays from methane molecules located below the jovian homopause. Our modeled brightnesses agree, up to a factor of two, with the bulk of low‐latitude ROSAT measurements. This suggests that solar photon scattering (approximately 90% elastic scattering) may act in conjunction with energetic heavy ion precipitation to generate jovian equatorial x‐ray emission.