Ionospheric quasi-biennial oscillation in global TEC observations

Ionospheric quasi-biennial oscillation in global TEC observations
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全球 TEC 观测中的电离层准两年一次振荡

DOI:
10.1016/j.jastp.2013.11.002
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发表时间:
2014
期刊:
J. Atmos. Solar. Terr. Phys.
影响因子:
--
通讯作者:
Dou Xiankang
Dou Xiankang
中科院分区:
其他
文献类型:
--
作者:
Tang Weiwei;Xue Xianghui;Lei Jiuhou;Dou Xiankang

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利用1999 - 2011年全球电离层准两年振荡(QBO)的总电子含量(TEC)观测资料,分析了全球电离层准两年振荡的特征。计算了TEC的纬向和月平均值,揭示了电离层的全球特征和长周期变化。Lomb-Scargle周期图方法和小波谱分析应用于TEC的残差,这是从减去与太阳指数F10.7的拟合获得的。电离层QBO信号只出现在太阳活动极大期,存在于50 ° S~50 ° N的所有纬度,周期为22-34个月。在赤道地区,QBO表现出明显的赤道电离层异常(EIA)特征,其位相转换比高纬地区晚2 - 6个月。与平流层QBO的相关系数达到0.704。可以假定平流层QBO影响电离层QBO现象,然而,目前的结果不允许得出结论的机制。
The total electron content (TEC) observations were analyzed for the ionospheric quasi-biennial oscillations (QBO) during the period of 1999–2011 in a global perspective. Zonal and monthly means of TEC data were calculated to reveal the global characteristics and long-period variations in ionosphere. The Lomb–Scargle periodogram methods and wavelet spectral analysis were applied to the residuals of TEC, which are obtained from subtracting the fittings with solar index, F10.7. The ionospheric QBO signal only appears during solar maximum, existing in all latitudes from 50°S to 50°N, and the period is within 22–34 months. In the equatorial region, the QBO exhibits a significant feature of equatorial ionospheric anomaly (EIA), where the transition of phases occurs 2–6 months later than in high latitude. The correlation coefficient with the stratospheric QBO reaches 0.704. It can be assumed that stratospheric QBO influences the QBO phenomenon in ionosphere; nevertheless, the present results do not permit one to conclude the mechanism.
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