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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Ionospheric O~+ Momentum Balance Through Charge ExchangeWith Thermospheric O Atoms
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Ionospheric O~+ Momentum Balance Through Charge ExchangeWith Thermospheric O Atoms

机译：通过电荷电离层O ~ +动量平衡ExchangeWith Thermospheric O原子

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摘要

One of the most notorious uncertainties in ionosphere/thermosphere physics concerns the cross section for resonant charge exchange between neutral atomic and ionized oxygen, O and O~+, the principle constituents between ～200–500 km in the terrestrial atmosphere. O ? O~+ charge exchange plays a vital role in both momentum and energy exchange between the thermosphere and ionosphere, such that the value of the cross section, Q_(O?O~+) , strongly influences calculations of plasma drift speeds, diffusion coefficients, and electron density distributions. We present an analysis of the nighttime O~+ momentum budget in the F region ionosphere, using an unprecedented 27-year baseline of observations from Arecibo Observatory, as a means to assess the agreement between the data, recent theoretical calculations of Q_(O?O~+) , and NRLMSISE-00 model predictions of O density, [O]. We find evidence for local time, seasonal, and solar cycle variation between the derived and modeled O ? O~+ collision frequency, with the best agreement observed near midnight at solar maximum. The data overall support our conclusion that recent theory regarding the magnitude of Q_(O?O~+) is likely accurate. Although biases in the momentum balance technique may account in part or in full for the local time and seasonal dependencies in observed O~+ momentum imbalances, the most likely source of the observed solar cycle variation is MSIS model underestimation of [O]. These findings serve to establish the O~+ momentum and energy balance techniques as a valuable means of remotely sensing thermospheric [O] in support of future model validation and development.
机译：其中最臭名昭著的不确定性电离层/热电离层物理问题截面谐振电荷交换在中性原子和电离氧气,O和O ~ + ~ 200 - 500之间的原则组成公里的陆地大气。在动量和交流中起着至关重要的作用热电离层和之间的能量交换电离层,十字架上的价值部分,Q_ (O ? O ~ +),强烈的影响计算等离子体漂移速度、扩散系数,和电子密度分布。我们提出的分析夜间O ~ +动量预算电离层F地区使用前所未有的27年的观察基线从阿雷西博天文台,作为评估手段之间的协议数据,最近理论计算的Q_ (O ? O ~ +),和NRLMSISE-00模型预测的密度,[O]。当地时间我们找到证据,季节性,派生和太阳周期变化建模啊?最好的协议在太阳附近观察到午夜最大值。,最近的理论有关的大小Q_ (O ? O ~ +)可能是准确的。动量平衡技术也许可以解释部分或全部为当地时间和季节性依赖关系在观察O ~ +动力失衡,观察到的太阳能的最可能的来源周期变化是低估的msi模型[O]。动量和能量平衡技术有价值的远程传感thermospheric的手段[O]未来模型的验证和支持发展。

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