Ionospheric quasi-biennial oscillation of the TEC amplitude of the equatorial ionization anomaly crests from continuous GPS data in the Southeast Asian region

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY VIETNAM JOURNAL OF EARTH SCIENCES Pub Date : 2022-09-05 DOI:10.15625/2615-9783/17490
Dung Nguyen Thanh, M. Huy, C. Amory-Mazaudier, R. Fleury, S. Saito, Thang Nguyen Chien, T. L. Truong, H. P. Thu, T. N. Ha, Mai Nguyen Thi, Que Le
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Abstract

The quasi-biennial oscillation (QBO) signals at two Equatorial ionization anomaly (EIA) crests of the ionosphere have been studied using the continuous GNSS network data in Vietnam and adjacent regions during the 2008- 2021 period. The monthly mean EIA crests amplitudes are calculated. The Lomb-Scargle periodogram method was applied to the residuals of the EIA crests magnitudes, DTEC, which are obtained from subtracting the fittings with solar index, F10.7. The Lomb-Scargle spectrum shows the quasi-biennial component in the residuals DTEC with the picks at 18, 25, and 29-30 months. The ionosphere QBO at two EIA crests was found out by the band-pass filter centered at 25 months with haft-power points at 17 and 33 months. The zonal wind data at 50 hPa (~ 20 km) of the tropical equatorial stratosphere is used as the stratosphere QBO (SQBO) to consider the relationship between the SQBO and the obtained ionosphere QBO. The direct comparison and the cross wavelet transform of the SQBO and ionosphere QBO data series show that during 2008-2009, the ionosphere QBO signal is low, the SQBO and ionosphere QBO are in phase during the 2010-2013 and 2018-2021 periods, but anti-phase during the 2014-2017 period. For the 2010-2013, 2014-2017 and 2018-2021 periods, the correlation coefficients are 0.623, 0.637, -0.646 in the northern crest, and 0.571, 0.53, -0.530 in the southern crest, respectively. Furthermore, we also observed that the SQBO and the ionosphere QBO signals were shortened during the 2015-2016 period, approximately 1.5 years. Previous studies showed that the ENSO (El Niño - Southern Oscillation) warm phase, also known as El-Niño existed during 2015-2016. The results of this study allow us to assume that the SQBO influences the ionosphere QBO. Our results show that the SQBO is the main factor affecting the ionospheric QBO at two EIA crests. However, the physical theoretical interpretation of the mechanisms of action is a challenge for scientists and requires further research.
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东南亚地区赤道电离异常TEC振幅的电离层准两年振荡
利用2008-2011年期间越南及邻近地区的连续GNSS网络数据,研究了电离层赤道电离异常(EIA)两个波峰的准两年振荡(QBO)信号。计算月平均EIA峰值振幅。将Lomb Scargle周期图方法应用于EIA峰值震级DTEC的残差,该残差是通过减去与太阳指数F10.7的拟合而获得的。Lom-Scargle谱显示了残差DTEC中的准两年期成分,其pick分别为18、25和29-30个月。以25个月为中心,轴功率点分别为17和33个月的带通滤波器发现了两个EIA峰值处的电离层QBO。使用热带赤道平流层50 hPa(~20 km)的纬向风数据作为平流层QBO(SQBO),以考虑SQBO与所获得的电离层QBO之间的关系。通过对SQBO和电离层QBO数据序列的直接比较和交叉小波变换表明,2008-2009年期间,电离层QBO信号较低,2010-2013年和2018-2021年期间SQBO与电离层QBO同相,2014-2017年期间相反。2010-2013年、2014-2017年和2018-2021年期间,北部波峰的相关系数分别为0.623、0.637和-0.646,南部波峰的相关性系数分别为0.571、0.53和-0.530。此外,我们还观察到,在2015-2016年期间,SQBO和电离层QBO信号缩短了约1.5年。先前的研究表明,2015年至2016年期间存在ENSO(厄尔尼诺-南方涛动)暖期,也称为厄尔尼诺。本研究的结果使我们能够假设SQBO影响电离层QBO。结果表明,SQBO是影响两个EIA峰电离层QBO的主要因素。然而,对作用机制的物理理论解释对科学家来说是一个挑战,需要进一步研究。
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来源期刊
VIETNAM JOURNAL OF EARTH SCIENCES
VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.60
自引率
20.00%
发文量
0
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