Variations of nitric oxide in the mesosphere and lower thermosphere over Antarctica associated with a magnetic storm in April 2012
Variations of nitric oxide in the mesosphere and lower thermosphere over Antarctica associated with a magnetic storm in April 2012
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DOI：
10.1002/2014gl059360
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发表时间：
2014-04
影响因子：
5.2
通讯作者：
Y. Isono;A. Mizuno;T. Nagahama;Y. Miyoshi;Takuji Nakamura;R. Kataoka;M. Tsutsumi;M. Ejiri;H. Fujiwara;H. Maezawa
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文献类型：
--
作者：
Y. Isono;A. Mizuno;T. Nagahama;Y. Miyoshi;Takuji Nakamura;R. Kataoka;M. Tsutsumi;M. Ejiri;H. Fujiwara;H. Maezawa
我们报告了在2012年4月的一次大型地磁风暴期间，安装在南极洲Syowa站的地面毫米波光谱辐射计观测到的一氧化氮(NO)柱密度的极端增强。从NO谱线形状和NO柱密度与太阳辐射的关系可以得出结论，NO是在75~100公里的高度范围内排放的。在恢复期，NO的柱密度逐渐增加。除了在几天的时间范围内的变化外，我们还发现了日变化。NO的增加与极轨运行环境卫星(POES)/气象卫星(Metop)观测到的30-300keV能量范围内的沉淀电子有关。我们发现它们之间存在快速反应(在1小时内)和一对一的对应关系。首次证明了等离子体片电子的黎明-黄昏不对称性导致了NO的柱密度显著增加。
We report extreme enhancements of the nitric oxide (NO) column density observed with the ground‐based millimeter‐wave spectroscopic radiometer installed at Syowa Station, Antarctica, during a large geomagnetic storm in April 2012. From the NO spectrum line shape and NO column density relationship with solar radiation, we concluded that the NO was emitted in the altitude range between 75 km and 100 km. The column density of NO gradually increased during the recovery phase. In addition to variations on a time frame of several days, we found diurnal variations. The increase of NO was related to precipitated electrons in the energy range of 30–300 keV observed by Polar‐orbiting Operational Environmental Satellite (POES)/The Meteorological Operational (METOP). We found a rapid response (within 1 h) and a one‐to‐one correspondence between them. For the first time, we show that a remarkable increase of the column density of NO is caused by dawn‐dusk asymmetry of the plasma sheet electrons.