An updated model of the hot nitrogen atom kinetics and thermospheric nitric oxide
An updated model of the hot nitrogen atom kinetics and thermospheric nitric oxide
复制标题
热氮原子动力学和热层一氧化氮的更新模型
DOI：
10.1029/96ja02868
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
J. Duff
中科院分区：
文献类型：
--
作者：
J. Gérard;D. Bisikalo;V. Shematovich;J. Duff
新的观测和对以前测量结果的重新分析表明，测量的热层一氧化氮密度向上修正。我们以前的模型的NO生产的快速N（4S）原子碰撞O2已更新。它包括软太阳X射线的影响，俄歇电子，和N2解离电离通道的详细治疗。此外，新的计算表明，在N + N2碰撞的平移能量的转移是不太有效的比在硬球近似。这一结果导致重新评估的能量依赖的弛豫截面和向上修订的N与O2的碰撞形成一氧化氮的反应效率。计算出的峰值NO密度增加的一个因素的10.2时，超热氮原子的影响包括在内。给出了N（4S）能量分布函数和NO浓度对太阳活动周期变化的模型响应。当太阳F10.7指数从70变化到245时，110 km处的NO浓度从5.4 × 107变化到1.3 × 108 cm−3，但其响应取决于随太阳活动而增加的软X射线的大小。
New observations and reanalysis of previous measurements suggest an upward revision of the measured thermospheric nitric oxide density. Our previous model of NO production by fast N(4S) atom collisions with O2 has been updated. It includes the effect of soft solar X rays, Auger electrons, and a detailed treatment of N2 dissociative ionization channels. In addition, new calculations indicate that the transfer of translational energy in N + N2 collisions is less efficient than in the hard sphere approximation. This result leads to reevaluation of the energy dependent relaxation cross section and to an upward revision of the reacting efficiency of collisions of N with O2 to form nitric oxide. The calculated peak NO density increases by a factor of ∼ 2 when the effect of superthermal nitrogen atoms is included. The model response of the N(4S) energy distribution function and NO density to solar cycle variations is presented. The NO density at 110 km changes from 5.4 × 107 to 1.3 × 108 cm−3 when the solar F10.7 index varies from 70 to 245, but its response depends on the magnitude of the soft X ray increase with solar activity.