Pattern of variation of TEC, hmF2 and foF2, and their correlation during the geomagnetic storm time conditions

IF 1.8 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Yekoye Asmare Tariku
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引用次数: 0

Abstract

This paper mainly examines the diurnal variation of the Total Electron Content (TEC) and critical frequency of the F2-layer (foF2) and their correlation with the height of the peak electron density (hmF2). This is carried out employing the observations (co-located Global Positioning System (GPS) and digisonde) and empirical models (International Reference Ionosphere, IRI, 2016 and IRI-extended to the Plasmasphere, IRI-Plas, 2017) in the low-to-high latitudes during relatively similar intense level geomagnetic storms that occurred during the high solar activity (February 19, 2014) and low solar activity (September 08, 2017). The GPS-derived TEC and digisonde-derived TEC, hmF2 and foF2 variabilities show large fluctuations on most of the stations when compared to the IRI 2016 and IRI-Plas 2017 variations. Moreover, the highest GPS-derived TEC values are observed when the hmF2 values reach in the ranges of about 270–309 km (low latitude), 203–266 km (mid latitude) and 259–311 km (high latitude) regions. The highest digisonde-derived TEC values are also depicted at the height ranges of about 256–451 km (low latitude), 250–326 km (mid latitude) and 309–388 km (high latitude) regions. In addition, the highest digisonde-derived foF2 values are observed when the hmF2 values reach about 253–384, 217–311 and 259–281 km in the low, mid and high latitudes, respectively. The model-derived TEC and foF2 variations also reveal that the highest values are generally observed at relatively similar height ranges with the observations. Moreover, the highest TEC and foF2 values are observed relatively at lower altitudes in the mid latitudes when compared to the low and high latitudes. The highest values also tend to move to the lower altitudes in shifting from the high to the low solar activity during similar intense level geomagnetic storms.

地磁暴时间条件下 TEC、hmF2 和 foF2 的变化规律及其相关性
本文主要研究了电子总含量(TEC)和F2层临界频率(foF2)的昼夜变化及其与电子密度峰值高度(hmF2)的相关性。在太阳活动剧烈期(2014年2月19日)和太阳活动剧烈期(2017年9月8日)发生的相对类似的强烈地磁暴期间,利用在低纬度到高纬度地区的观测数据(同位全球定位系统(GPS)和digisonde)和经验模型(国际参考电离层,IRI,2016年和IRI-扩展到等离子体,IRI-Plas,2017年)进行了研究。与 2016 年 IRI 和 2017 年 IRI-Plas 的变化相比,GPS 导出的 TEC 和 digisond 导出的 TEC、hmF2 和 foF2 变率在大多数台站显示出较大的波动。此外,当 hmF2 值达到约 270-309km(低纬度)、203-266km(中纬度)和 259-311km(高纬度)区域时,GPS 导出的 TEC 值最高。数字秒针得出的最高 TEC 值也出现在约 256-451 千米(低纬度)、250-326 千米(中纬度)和 309-388 千米(高纬度)的高度范围内。此外,在低纬度、中纬度和高纬度地区,当 hmF2 值分别达到约 253-384、217-311 和 259-281 千米时,数字秒针得出的 foF2 值最高。从模式推导的 TEC 和 foF2 变化还可以看出,最高值一般出现在与观测值相对类似的高度范围内。此外,与低纬度和高纬度相比,在中纬度的较低高度观测到了最高的 TEC 和 foF2 值。在类似强烈程度的地磁暴期间,最高值也倾向于从太阳活动的高点向低点移动。
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来源期刊
Journal of Atmospheric and Solar-Terrestrial Physics
Journal of Atmospheric and Solar-Terrestrial Physics 地学-地球化学与地球物理
CiteScore
4.10
自引率
5.30%
发文量
95
审稿时长
6 months
期刊介绍: The Journal of Atmospheric and Solar-Terrestrial Physics (JASTP) is an international journal concerned with the inter-disciplinary science of the Earth''s atmospheric and space environment, especially the highly varied and highly variable physical phenomena that occur in this natural laboratory and the processes that couple them. The journal covers the physical processes operating in the troposphere, stratosphere, mesosphere, thermosphere, ionosphere, magnetosphere, the Sun, interplanetary medium, and heliosphere. Phenomena occurring in other "spheres", solar influences on climate, and supporting laboratory measurements are also considered. The journal deals especially with the coupling between the different regions. Solar flares, coronal mass ejections, and other energetic events on the Sun create interesting and important perturbations in the near-Earth space environment. The physics of such "space weather" is central to the Journal of Atmospheric and Solar-Terrestrial Physics and the journal welcomes papers that lead in the direction of a predictive understanding of the coupled system. Regarding the upper atmosphere, the subjects of aeronomy, geomagnetism and geoelectricity, auroral phenomena, radio wave propagation, and plasma instabilities, are examples within the broad field of solar-terrestrial physics which emphasise the energy exchange between the solar wind, the magnetospheric and ionospheric plasmas, and the neutral gas. In the lower atmosphere, topics covered range from mesoscale to global scale dynamics, to atmospheric electricity, lightning and its effects, and to anthropogenic changes.
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