Characterization of ionospheric irregularities over Vietnam and adjacent region for the 2008-2018 period

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY VIETNAM JOURNAL OF EARTH SCIENCES Pub Date : 2021-08-30 DOI:10.15625/2615-9783/16502
Dung Nguyen Thanh, M. Huy, C. Amory-Mazaudier, R. Fleury, S. Saito, Thang Nguyen Chien, H. P. Thu, T. L. Truong, Mai Nguyen Thi
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引用次数: 2

Abstract

This paper presents the variations of the rate of change of Total Electron Content (TEC) index (ROTI), characterizing the occurrence of ionospheric plasma irregularities over Vietnam and neighboring countries in the Southeast Asian region using the continuous GPS data during the 2008-2018 period. The results showed that the occurrence of strong ROTI in all stations is maximum in equinox months March/April and September/October and depends on solar activity. The ROTI is weak during periods of low solar activity and strong during periods of high solar activity. There is an asymmetry between the two equinoxes. During maximum and declining phases of 2014-2016, occurrence rates in March equinox are larger than in September equinox, but during the descending period of 2010-2011, the occurrence rates in September equinox at almost all stations are larger than in March equinox. The correlation coefficients between the monthly occurrence rate of irregularities and the F10.7 solar index at the stations in the equatorward EIA crest region are higher than at those in the magnetic equatorial and the poleward EIA crest regions. The irregularity occurrence is high in the pre-midnight sector, maximum between 2000 LT to 2200 LT. The maximum irregularity occurrence is located around 4-5° degrees in latitude equator-ward away from the anomaly crests.
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2008-2018年越南及其邻近地区电离层不规则性特征
本文介绍了2008-2018年期间总电子含量(TEC)指数(ROTI)变化率的变化,利用连续GPS数据描述了越南和东南亚地区邻国电离层等离子体不规则现象的发生。结果表明,各气象站的强ROTI在3月/4月和9月/10月的春分月份出现最多,这取决于太阳活动。ROTI在低太阳活动期较弱,在高太阳活动期较强。两个分点之间存在不对称性。在2014-2016年的最大值和下降期,春分的发生率大于春分,但在2010-2011年的下降期,几乎所有站点的春分发生率都大于春分。赤道向EIA峰区台站的月不规则发生率与F10.7太阳指数之间的相关系数高于磁赤道和极地EIA峰区。午夜前扇区的不规则性发生率很高,最大值在2000 LT至2200 LT之间。最大不规则性出现在纬度赤道向异常峰方向4-5°左右。
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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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