Modelling Ionospheric Phenomena and Assessing the Performance of IRIPlas2017 during Different Phases of Solar Cycle 24

IF 0.5 4区 物理与天体物理 Q4 ASTRONOMY & ASTROPHYSICS
Y. O. Kayode, F. E. Ikuemonisan, L. Garba, D. Okoh, E. O. Onori, O.O. Ometan, A. J. Alomaja, A. S. Ajose
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Abstract

Ionospheric modelling is one of the most powerful tools for studying the behavior of the ionosphere. The aim of this paper is to assess the performance of IRI-Plas2017 in five different longitudinal sectors during different phases of solar cycle 24 (2011–2017). An hourly mean value of Total Electron Content (TEC) was used to study the diurnal and seasonal variations in TEC. An annual error plot profiled on monthly basis was used to study the difference between the measured and predicted TEC values. The annual TEC deviations were used to investigate the relationship between TEC derived from Global Positioning System (GPS) and IRI-Plas2017 model. Our results showed that the highest peak value of TEC was recorded as ~89 TECU (06:00UT) in the Asian sector (BAKO) while the lowest peak value of ~22 TECU (08:00UT) was recorded in the Australian sector (DAV1) in the ascending and descending phase during the March equinox respectively. Semi-Annual variation is a prevailing factor in all the solar cycle phases in the Africa and Asian sectors except during the descending and maximum phase where anomalies were recorded. Semi-annual anomalies were also prominent in all the solar cycle phases in the Australian, American, and Asian sectors. Winter anomaly was predominant in all the phases of solar cycle in the American, Asian, and European sectors. However, the IRI-Plas2017 model was not able to appropriately reproduce the two prominent phenomena (Semi-annual Variations and Winter Anomalies) observed in all the five longitudinal sectors.

Abstract Image

第24太阳周期不同阶段IRIPlas2017电离层现象模拟及性能评估
电离层模拟是研究电离层行为最有力的工具之一。本文的目的是评估ir - plas2017在太阳周期24(2011-2017)不同阶段的五个不同纵向扇区的性能。总电子含量(TEC)的每小时平均值用于研究TEC的日变化和季节变化。采用按月绘制的年误差图来研究TEC实测值与预测值之间的差异。利用全球定位系统(GPS)获得的TEC与IRI-Plas2017模型之间的年度偏差来研究TEC之间的关系。结果表明,亚洲扇区(BAKO)的TEC峰值为~89 TECU (06:00UT),澳大利亚扇区(DAV1)的TEC最低峰值为~22 TECU (08:00UT),分别出现在春分上升和下降阶段。在非洲和亚洲扇区的所有太阳周期阶段,半年变化是一个主要因素,除了记录到异常的下降期和极大期。在澳大利亚、美洲和亚洲地区的所有太阳周期阶段,半年异常现象也很突出。冬季异常在美洲、亚洲和欧洲扇区太阳活动周期的所有阶段均占主导地位。然而,IRI-Plas2017模型无法正确再现所有五个纵向扇区观测到的两个突出现象(半年变化和冬季异常)。
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来源期刊
Kinematics and Physics of Celestial Bodies
Kinematics and Physics of Celestial Bodies ASTRONOMY & ASTROPHYSICS-
CiteScore
0.90
自引率
40.00%
发文量
24
审稿时长
>12 weeks
期刊介绍: Kinematics and Physics of Celestial Bodies is an international peer reviewed journal that publishes original regular and review papers on positional and theoretical astronomy, Earth’s rotation and geodynamics, dynamics and physics of bodies of the Solar System, solar physics, physics of stars and interstellar medium, structure and dynamics of the Galaxy, extragalactic astronomy, atmospheric optics and astronomical climate, instruments and devices, and mathematical processing of astronomical information. The journal welcomes manuscripts from all countries in the English or Russian language.
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