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:
影响因子:
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通讯作者:
Newnham D
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文献类型:
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作者:
Newnham D
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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DOI:
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发表时间:
2007
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作者:
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通讯作者:
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DOI:
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