2015年3月地磁暴期间总电子含量扰动与地磁活动AE指数的关系

IF 0.9 Q4 GEOCHEMISTRY & GEOPHYSICS
Kupriyan V. Belyuchenko, M. Klimenko, V. Klimenko, K. Ratovsky
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引用次数: 0

摘要

使用热球、电离层、质子圈全球自洽模型(GSM TIP)的模拟,研究了电离层对2015年3月17日地磁暴的响应[Dmitriev等人,2017;Klimenko等人,2018]。GSM TIP证明了与实验数据不矛盾的结果。本文研究了2015年3月17日至23日不同经度和纬向平均值下总电子含量(TEC)的GSM TIP模拟扰动。在所有经度上,我们都可以观察到位于地赤道上方的TEC正扰动带的存在,以及风暴后电离层效应的形成,该效应在地磁暴主相后3-5天的中纬度以正TEC扰动的形式出现。我们分析了热层-电离层系统的扰动(总电子含量,n(N2),n(O),纬向电场,300公里高度的热层风的经向分量,和1000公里高度的电子温度)的依赖性,由地磁活动指数AE的变化通过GSM TIP计算。该分析基于Pearson相关系数,以所选经度和纬向平均值的相关系数与UT和纬度的相关性图的形式呈现。结果表明,在北半球和南半球的高纬度地区,在12 UT至23 UT期间,TEC扰动和AE变化的相关系数在所有经度都接近1。在9 UT至12 UT期间,所有纬度和经度的相关系数最小。相关值的时间间隔与特定地磁暴的特征相关联,例如,2015年3月17日从12 UT到23 UT的间隔对应于地磁暴主相位。我们讨论了模拟TEC扰动和AE指数之间形成这种关系的可能机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Connection of total electron content disturbances with AE index of geomagnetic activity during geomagnetic storm in March 2015
Ionospheric response to the March 17, 2015 geomagnetic storm has been investigated using simulations of the Global Self-consistent Model of the Thermosphere, Ionosphere, Protonosphere (GSM TIP) [Dmitriev et al., 2017; Klimenko et al., 2018]. GSM TIP demonstrates results that do not contradict experimental data. This paper deals with GSM TIP simulated disturbances in the Total Electron Content (TEC) at different longitudes and zonal averages on March 17–23, 2015. At all longitudes, we can observe the existence of a band of TEC positive disturbances, located over the geomagnetic equator, and the formation of an after-storm ionospheric effect that appeared as positive TEC disturbances at midlatitude 3–5 days after the geomagnetic storm main phase. We have analyzed the dependence of disturbances of the thermosphere-ionosphere system (total electron content, n(N2), n(O), zonal electric field, meridional component of the thermospheric wind at a height of 300 km, and electron temperature at a height of 1000 km), calculated by GSM TIP from variations in the geomagnetic activity index AE. The analysis is based on Pearson’s correlation coefficients, presented as maps of the dependence of the correlation coefficient on UT and latitude for selected longitudes and for zonal averaged values. The results suggest that at high latitudes of the Northern and Southern hemispheres the correlation coefficient of TEC disturbances and AE variations is close to 1 at all longitudes in the period from 12 UT to 23 UT. From 9 UT to 12 UT, the minimum value of the correlation coefficient is observed at all latitudes and longitudes. The time intervals of the correlation values are associated with the features of a particular geomagnetic storm, for which, for example, the interval from 12 UT to 23 UT on March 17, 2015 corresponds to the geomagnetic storm main phase. We discuss possible mechanisms for the formation of such a relationship between simulated TEC disturbances and the AE index.
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来源期刊
Solar-Terrestrial Physics
Solar-Terrestrial Physics GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.50
自引率
9.10%
发文量
38
审稿时长
12 weeks
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