Quantifying day-to-day variability of O/N2 and its correlation with geomagnetic activity using GOLD
Quantifying day-to-day variability of O/N2 and its correlation with geomagnetic activity using GOLD
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DOI：
10.3389/fspas.2023.1129279
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发表时间：
2023-02
期刊：
影响因子：
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通讯作者：
Benjamin C. Martinez;Xian Lu
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文献类型：
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作者：
Benjamin C. Martinez;Xian Lu
我们量化了GOLD从2019年1月到2022年8月在各种地磁活动条件下测量的O/N2柱的短期（<30天）变化。我们发现，在高纬度地区的活动（Kp ≥ 3.0）时间和弱，但在低纬度地区的统计上显着的变化增强的变化。在秋季，O/N2比值的最大绝对变率为0.14，最大相对变率为20.6%，是平静期O/N2比值绝对变率和相对变率的2倍。高纬度地区的变率可能比低纬度地区大5-8倍。通过将O/N2扰动与Dst相关联，我们进一步量化了磁层强迫对电离层-热层区域O/N2变化的贡献。在地磁活跃期，高纬度和低纬度的正相关性分别高达+0.66和-0.65，表明风暴引起的O和N2在高纬度上升流和在低纬度下降流。在平静的时候，O/N2扰动和DST之间的相关性变得微不足道，在所有纬度，这意味着更实质性的贡献从下面。O/N2的变化在秋季最大，向夏季逐渐减小，相关性在春/夏季最大，冬/春季逐渐减小，这可能与地磁活动和平均环流的季节变化有关。
We quantify the short-term (<30 day) variability of column O/N2 measured by GOLD from January 2019 to August 2022 for various geomagnetic activity conditions. We find enhanced variabilities at high latitudes during active (Kp ≥ 3.0) times and weak but statistically significant variabilities at low latitudes. For active times, the largest absolute variability of O/N2 ratio is 0.14 and the largest relative variability is 20.6% at ∼60.0°N in Fall, which are about twice those of quiet times. The variability at higher latitudes can be larger than that of lower latitudes by a factor of 5–8. We further quantify contributions of magnetospheric forcing to O/N2 variability in the Ionosphere-Thermosphere region by correlating O/N2 perturbations with Dst. During geomagnetic active times, positive correlations as large as +0.66 and negative correlations as large as −0.65 are found at high and low latitudes, respectively, indicative of storm-induced O and N2 upwelling at high latitudes and down welling at low latitudes. During quiet times, correlations between O/N2 perturbations and Dst become insignificant at all latitudes, implying a more substantial contribution from below. O/N2 variabilities maximize in Fall and decrease towards Summer, while correlations maximize in Spring/Summer and decrease in Winter/Spring, which may be related to seasonal variations of geomagnetic activity and mean circulation.