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Observations of ionospheric irregularities and its correspondence with sporadic e occurrence over South Korea and Japan
Advances in Space Research ( IF 2.177 ) Pub Date : 2021-01-19 , DOI: 10.1016/j.asr.2021.01.013
Patrick Mungufeni; Yong Ha Kim; Nicholas Ssessenga

This study analyzed the occurrence of ionospheric irregularities over South Korea and Japan (mid-latitudes) during the years 2010–2015. The irregularities were quantified using the rate of change of total electron content (TEC) index (ROTI), which detects irregularities with scale sizes in the range of 400 m–2.5 km. The ROTI threshold for an ionospheric irregularity to have occurred was set as 0.1 TECU/min. Results showed that ionospheric irregularities mostly occur during night-time and around local noon-time in the seasons of spring and summer. In addition, the percentage of ionospheric irregularities had a high positive correlation with solar flux (F10.7) (r > 0.72). For the first time, we showed good correspondence between ionospheric irregularities measured by the ROTI index and sporadic E (Es). The median ROTI associated with ionospheric irregularities over a South Korea station (DAEJ) and a Japan station (KGNI) were 0.131 and 0.125 TECU/min, respectively. However, in severe cases of ionospheric irregularities, the ROTI values over DAEJ (KGNI) can reach 0.246 (0.217) and 0.314 (0.339) TECU/min during day and night, respectively. These critical ROTI values can be important in interpreting and monitoring ionospheric irregularity occurrence over South Korea and Japan.



中文翻译:

韩国和日本电离层不规则现象及其与电子零星发生的对应关系

这项研究分析了2010-2015年韩国和日本(中纬度)电离层不规则现象的发生。使用总电子含量变化率(TEC)指数(ROTI)对不规则进行定量,该比率可检测400 m–2.5 km范围内的不规则大小。将发生电离层不规则的ROTI阈值设置为0.1 TECU / min。结果表明,电离层不规则现象主要发生在春季和夏季的夜间和当地中午左右。另外,电离层不规则度的百分比与太阳通量(F10.7)具有高度正相关(r> 0.72)。第一次,我们展示了由ROTI指数测得的电离层不规则与零星E(Es)之间的良好对应关系。韩国站(DAEJ)和日本站(KGNI)上与电离层不规则相关的平均ROTI分别为0.131 TECU / min和0.125 TECU / min。但是,在严重的电离层不规则情况下,白天和黑夜时,DAEJ(KGNI)上的ROTI值分别可以达到0.246(0.217)和0.314(0.339)TECU / min。这些关键的ROTI值对于解释和监视韩国和日本的电离层不规则现象可能很重要。

更新日期:2021-02-22
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