Observations of nitric oxide in the Antarctic middle atmosphere during recurrent geomagnetic storms

Observations of nitric oxide in the Antarctic middle atmosphere during recurrent geomagnetic storms
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周期性地磁暴期间南极中层大气中一氧化氮的观测

DOI:
10.1002/2013ja019056
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发表时间:
2013
期刊:
Space Physics
影响因子:
--
通讯作者:
Newnham D
Newnham D
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作者:
Newnham D

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我们报告了使用部署在南极Troll站(72°01′S 02°32′E,L壳层L = 4.8)的230-250 GHz被动微波辐射计对极地中层大气进行的地面测量。我们的观测结果表明,增强中层一氧化氮(NO)的体积混合比(VMR)在一系列的小周期性地磁风暴在2008年南冬季,达到1.2 ppmv的第200天(7月18日)。在2008年5月9日至8月7日的第130至220天,在65 - 80公里范围内平均的NO VMR时间序列的Lomb归一化周期图显示,在25.8天出现了一个超过95%置信限的峰值,接近低纬度日冕洞的会合旋转周期。对于L = 3.5 - 5.5,极轨环境卫星90°望远镜的辐射计NO VMR数据与捕获和准捕获电子计数率之间的最高相关性为>30 keV(90 e1)通道(rmax= 0.56,滞后时间为5.1天)和>100 keV(90 e2)通道(rmax= 0.57,滞后时间为4.4天)。NO VMR和>700 keV(90 P6)通道数据之间的最大相关性较低,但滞后时间接近于零。在90天的观测期内,对8个最重要的磁暴期和3个卡林顿旋转(2070 - 2072)的叠加历元分析表明,在南极中层65 - 80公里处观测到的显著NO丰度可能直接由>200 keV的电子沉淀产生,或者源自更高海拔的来源,例如,产生>30 keV电子,然后向下传输。
We report ground‐based measurements of the polar middle atmosphere made using a 230–250 GHz passive microwave radiometer deployed at Troll station (72°01′S 02°32′E,Lshell ofL= 4.8), Antarctica. Our observations show enhanced mesospheric nitric oxide (NO) volume mixing ratio (VMR) during a series of small recurrent geomagnetic storms in the 2008 austral winter, reaching 1.2 ppmv on day 200 (18 July). The Lomb normalized periodogram of the NO VMR time series averaged over 65‐80 km for days 130 to 220 of 2008 (9 May to 7 August) shows a peak exceeding the 95% confidence limit at 25.8 days, close to the synodic rotation period for low‐latitude solar coronal holes. The highest correlations between the radiometer NO VMR data and trapped and quasi‐trapped electron count rates forL= 3.5‐5.5 from the Polar Orbiting Environment Satellites 90° telescope are for the >30 keV (90e1) channel (rmax= 0.56, lag time of 5.1 days) and >100 keV (90e2) channel (rmax= 0.57, lag time of 4.4 days). Maximum correlation between NO VMR and the >700 keV (90P6) channel data is lower but lag times are close to zero. Superposed epoch analyses for the eight most significant geomagnetic storm periods and three Carrington rotations (2070‐2072) within the 90 day observation period indicate that significant NO abundance observed at 65‐80 km in the Antarctic mesosphere may be produced directly by >200 keV electron precipitation or originate from a source at higher altitudes, e.g., production by >30 keV electrons followed by downward transport.
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