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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Nonthermal radiative transfer of oxygen 98.9nm ultraviolet emission: Solving an old mystery
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Nonthermal radiative transfer of oxygen 98.9nm ultraviolet emission: Solving an old mystery

机译：非热能的辐射传输氧气98.9海里紫外发射:解决一个古老的谜

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摘要

Sounding rocket measurements conducted in 1988 under high solar activity conditions revealed that the intensity of thermospheric OI emissions at 98.9nm presents an anomalous vertical profile, showing exospheric intensities much higher than expected from radiative transfer model results, which included the known sources of excited oxygen. All attempts based on modeling of the photochemical processes and radiative transfer were unable to account for the higher than predicted brightnesses. More recently, the SOHO-Solar Ultraviolet Measurements of Emitted Radiation instrument measured the UV solar flux at high-spectral resolution, revealing the importance of a significant additional source of oxygen emission at 98.9nm that had not been accounted for before. In this study, we simulate the radiative transfer of the OI-98.9nm multiplet, including the photochemical sources of excited oxygen, the resonant scattering of solar photons, and the effects of nonthermal atoms, i.e., a population of fast-moving oxygen atoms in excess of the Maxwellian distribution. Including resonance scattering of the 98.9nm solar multiplet, we find good agreement with the previous sounding rocket observation. The inclusion of a nonthermal oxygen population with a consistent increase of the total density produces a larger intensity at high altitude that apparently better accounts for the observation, but such a correction cannot be demonstrated given the uncertainties of the observations. A good agreement between model and sounding rocket observation is also found with the triplet at 130.4 nm. We further investigate the radiative transfer of the OI-98.9nm multiplet and the oxygen emissions at 130.4 and 135.6nm using observations from the STP78-1 satellite. We find a less satisfying agreement between the model and the STP78-1 data that can be accounted for by scaling the modeled intensity within a range acceptable given the uncertainties on the STP78-1 absolute calibration.
机译：1988年探空火箭进行测量高的太阳活动的条件下的强度thermospheric OI排放98.9 nm呈现出一种异常垂直剖面,外逸层的强度远高于从辐射传输模型预期的结果,包括已知来源的兴奋氧气。光化学过程和辐射传输无法占比预测亮度。SOHO-Solar发出的紫外线测量结果紫外线辐射仪测量了太阳能通量在high-spectral解析,揭示了的大量额外来源的重要性在98.9海里,没有氧气排放占前。oi的辐射传输- 98.9 nm多重态,包括光化学的来源兴奋的氧气,太阳能的共振散射光子和非热能的原子的影响,例如,人口的快速移动的氧原子多余的麦克斯韦分布。共振散射98.9 nm的太阳能多重态,我们找到好的协议以前的探空火箭的观察。包含人口与非热能的氧气一致的总密度的增加产生更大的强度在高海拔显然更好的观察,但这样的调整不能证明考虑到不确定性的观察。良好的协议模型和探空火箭观察还发现,三联体130.4纳米。转让oi - 98.9 nm多重态和在130.4和135.6 nm使用氧气排放从STP78-1卫星观测。不太令人满意的模型和之间的协议STP78-1数据所占扩展模型强度范围内接受STP78-1上的不确定性绝对校准。

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