Direct observations of nitric oxide produced by energetic electron precipitation into the Antarctic middle atmosphere NITRIC OXIDE PRODUCTION BY EEP
Direct observations of nitric oxide produced by energetic electron precipitation into the Antarctic middle atmosphere NITRIC OXIDE PRODUCTION BY EEP
复制标题
直接观测南极中层大气中高能电子沉淀产生的一氧化氮 EEP 生产一氧化氮
DOI：
10.1029/2011gl048666
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发表时间：
2011
影响因子：
5.2
通讯作者：
Newnham D
中科院分区：
文献类型：
--
作者：
Newnham D
我们报告了在南极洲Troll站进行的第一次地面被动微波观测，该观测显示，在2008年相对孤立的小地磁风暴期间，在70-80公里处，中间层一氧化氮（NO）体积混合比增强达到1.2 ppmv，或高于背景2-3个数量级。在SABER卫星测得的更高高度（110 ~ 150 km） NO增强后2 d，在POES测得的bbb30 keV和bbb300 keV电子通量达到峰值后2 d，尽管300 keV电子通量仍然很高。高时间分辨率数据表明，中间层NO在夜间增强，白天衰减，并在3 ~ 4天的时间内积累到较高水平。中间层NO的高度剖面图表明直接产生于~ 300 keV的电子沉淀。使用Sodankylä离子和中性化学模型的模拟表明，热层和中间层之间的NO增强延迟主要是由于在较低海拔地区，约300 keV的电子与强烈的日间损失相竞争，产生较弱的生成速率。
We report the first ground‐based passive microwave observations made from Troll station, Antarctica, which show enhanced mesospheric nitric oxide (NO) volume mixing ratio reaching levels of 1.2 ppmv, or 2–3 orders of magnitude above background, at 70–80 km during small, relatively isolated geomagnetic storms in 2008. The mesospheric NO peaked 2 days after enhanced NO at higher altitudes (110–150 km) measured by the SABER satellite, and 2 days after peaks in the >30 keV and >300 keV electron flux measured by POES, although the 300 keV electron flux remained high. High time resolution data shows that mesospheric NO was enhanced at night and decayed during the day and built up to high levels over a period of 3–4 days. The altitude profile of mesospheric NO suggests direct production by ∼300 keV electron precipitation. Simulations using the Sodankylä Ion and Neutral Chemistry model show that the delay between thermospheric and mesospheric NO enhancements was primarily a result of the weaker production rate at lower altitudes by ∼300 keV electrons competing against strong day‐time losses.