Storm-time behaviors of O/N2 and NO variations
Storm-time behaviors of O/N2 and NO variations
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DOI：
10.1016/j.jastp.2014.04.003
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发表时间：
2014-07
影响因子：
1.9
通讯作者：
Yongliang Zhang;L. Paxton;D. Morrison;D. Marsh;H. Kil
中科院分区：
文献类型：
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作者：
Yongliang Zhang;L. Paxton;D. Morrison;D. Marsh;H. Kil
从白天的TIMED/GUVI光谱仪数据中提取172-182 nm波长范围内的净一氧化氮（NO）辐射度的算法已经开发出来，并将其转换为NO柱密度（100-150 km）。从摄谱仪数据中还得到了热层O/ n2柱密度比（参考海拔~135 km， n2柱密度为1017cm−2）。GUVI轨道上NO和O/ n2产物的空间分辨率为240 km。少量地磁暴期间的O/ n2比值和NO柱密度重合图揭示了两个主要特征：(1)风暴时间O/ n2耗竭和NO增强从高纬度向中低纬度延伸。(2)在局地尺度上，NO增强覆盖的经纬度范围比O/ n2耗竭更广。在全球尺度上，O/ n2耗损和NO增强之间的相似性是由于风暴时赤道向经向风将O/ n2耗损和NO增强的空气从高纬度带到低纬度。暴雨时间经向风的高度依赖性、局地O/ n2和NO变化的不同高峰高度以及NO的长寿命（1天或更长）可以解释局地尺度上O/ n2和NO的不同行为。
Algorithms have been developed to extract net nitric oxide (NO) radiances in the wavelength range of 172–182 nm from the dayside TIMED/GUVI spectrograph data and convert them to NO column density (100–150 km). The thermospheric O/N2column density ratios (referenced from an altitude ~135 km with a N2column density of 1017cm−2) are also obtained from the spectrograph data. The spatial resolution of the NO and O/N2products along the GUVI orbit is 240 km. The coincident O/N2ratio and NO column density maps during a few geomagnetic storms reveal two major features: (1) Storm-time O/N2depletion and NO enhancement extend from high to mid and low latitudes. They are anti-correlated on a global scale, (2) the NO enhancement covers a wider longitude and latitude region than O/N2depletion on a local scale. The similarity between O/N2depletion and NO enhancement on global scale is due to storm-time equatorward meridional wind that brings both O/N2depleted and NO enhanced air from high to low latitudes. The altitude dependence of the storm-time meridional wind, different peaks altitudes of the local O/N2and NO variations, and long life time of NO (one day or longer) may explain the different behaviors of O/N2and NO on a local scale.