In this study, we analyze the main features of the 2‐day photochemical oscillations (2DPO) in the mesopause region (80–90 km) caused by the nonlinear response of mesospheric chemistry to 1‐day variations of solar radiation. The main indicators of 2DPO useful for subsequent detection of this phenomenon in satellite data are extracted from the theoretical data sets obtained using different chemical‐transport modeling approaches. The indicators are applied to find examples of these oscillations in the nighttime profiles of H and O concentration for the year 2003, taken from the SABER database. The 2DPO appearance/suppression is controlled by a local value of vertical eddy diffusion coefficient which is a critical parameter for three‐dimensional constituent distributions in the upper mesosphere and lower thermosphere. Thus, the experimental registration of 2DPO can be used to validate and subsequently improve the retrieval procedures in future determinations of a detailed distribution of .

中文翻译：

---

中绝经期区域的2天光化学振荡：第一个实验证据？

在这项研究中，我们分析了中层化学区对太阳辐射1天变化的非线性响应引起的中经期地区（80-90 km）的2天光化学振荡（2DPO）的主要特征。2DPO的主要指标可用于随后检测卫星数据中的这种现象，是从使用不同化学迁移建模方法获得的理论数据集中提取的。这些指标用于查找SABER数据库中2003年H和O浓度夜间分布中的这些波动示例。2DPO的出现/抑制由垂直涡扩散系数的局部值控制这是上部中层和下部热层中三维成分分布的关键参数。因此，在将来确定2DPO的详细分布时，可以使用2DPO的实验注册来验证和随后改进检索过程。