Spatial and seasonal effects on the delayed ionospheric response to solar EUV changes
Spatial and seasonal effects on the delayed ionospheric response to solar EUV changes
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DOI：
10.5194/angeo-38-149-2020
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发表时间：
2019-07
影响因子：
1.9
通讯作者：
Erik Schmölter;J. Berdermann;N. Jakowski;C. Jacobi
中科院分区：
文献类型：
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作者：
Erik Schmölter;J. Berdermann;N. Jakowski;C. Jacobi
摘要。本研究将不同电离层参数与太阳极紫外线（EUV）综合辐射相关联，分析电离层延迟响应，对以往电离层延迟研究进行验证和改进。用相关系数和延迟时间序列描述了2011年1月至2013年12月的电离层延迟变化趋势。通过不同时间尺度的计算以及与太阳和地磁活动的比较，讨论和说明了电离层参数日变化对固定地点每小时分辨率分析的影响。计算出欧洲4个站点总电子含量（TEC）的平均延迟约为18.7 h， foF2的平均延迟约为18.6 h。通过与澳大利亚地区的比较，分析了南北半球之间的差异。计算了北半球和南半球之间延迟的季节变化，TEC为≈5±0.7 h， foF2为≈8±0.8 h。分析了欧洲地区延迟的纬向和纵向变化，发现夏季月份的延迟从30°N时的≈21.5 h减少到70°N时的≈19.0 h。对于冬季月份，计算出大致恒定的延迟≈19.5 h。基于逐时分辨率的太阳和电离层数据以及电离层对太阳极紫外线的延迟响应分析的结果显示了季节和纬度的变化。结果还表明电离层延迟与地磁活动有关，并可能与所分析时间内11年的太阳周期有关。
Abstract. This study correlates different ionospheric parameters with the integrated solar extreme ultraviolet radiation (EUV) radiation to analyze the delayed ionospheric response, testing and improving upon previous studies on the ionospheric delay. Several time series of correlation coefficients and delays are presented to characterize the trend of the ionospheric delay from January 2011 to December 2013. The impact of the diurnal variations of ionospheric parameters in the analysis at an hourly resolution for fixed locations are discussed and specified with calculations in different timescales and with comparison to solar and geomagnetic activity. An average delay for the total electron content (TEC) of ≈18.7 h and for foF2 of ≈18.6 h is calculated at four European stations. The difference between the Northern and Southern hemispheres is analyzed by comparisons with the Australian region. A seasonal variation of the delay between the Northern and Southern hemispheres is calculated for TEC with ≈5±0.7 h and foF2 with ≈8±0.8 h. The latitudinal and longitudinal variability of the delay is analyzed for the European region, and found to be characterized by a decrease in the delay from ≈21.5 h at 30∘ N to ≈19.0 h at 70∘ N for summer months. For winter months, a roughly constant delay of ≈19.5 h is calculated. The results based on solar and ionospheric data at an hourly resolution and the analysis of the delayed ionospheric response to solar EUV show seasonal and latitudinal variations. Results also indicate a relationship of the ionospheric delay with geomagnetic activity and a possible correlation with the 11-year solar cycle in the analyzed time period.