Global Ionospheric and Thermospheric Effects of the June 2015 Geomagnetic Disturbances: Multi-Instrumental Observations and Modeling.
Global Ionospheric and Thermospheric Effects of the June 2015 Geomagnetic Disturbances: Multi-Instrumental Observations and Modeling.
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DOI：
10.1002/2017ja024174
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
van den IJssel J
中科院分区：
文献类型：
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作者：
Astafyeva E;Zakharenkova I;Huba JD;Doornbos E;van den IJssel J
通过使用来自多个仪器的数据，我们研究了2015年6月21日至23日期间的电离层/热层行为，当时三个不同强度的行星际冲击（IS）到达地球。6月21日16：45 UT记录了第一例IS，导致SYM-H指数增加约50 nT。第二个IS于6月22日5时45分到达，并引起极光/亚暴活动的增强，导致高纬度热层中性质量密度和电离层垂直总电子含量迅速增加。几个小时后，顶侧电子含量和电子密度增加，在低纬度的夜侧。第三个也是更大的IS于6月22日18：30到达，并引发了一场持续数小时的大型地磁风暴。这场风暴对昼侧和夜侧的热层和电离层都产生了重大影响。在热层中，昼侧的中性质量密度超过安静时间水平的300- 500%，在夏季半球的影响更大。在电离层中，无论是正面和负面的风暴影响，观察到在白天和黑夜。我们比较了电离层观测与模拟耦合Sami 3也是电离层/水稻对流模型（SAMI 3/RCM）模式。我们发现相当好的协议的数据和模型的第一阶段的风暴，当即时穿透电场（PPEF）的主要驱动程序。在风暴主相结束时，当电离层的影响，最有可能的是，由PPEF和热层风的组合驱动，模拟结果同意与观测。分析了2015年6月22 - 23日发生的地磁扰动（亚暴和大暴）对全球电离层/热层的影响。SAMI 3/RCM模式在磁暴发生的第一阶段与观测结果吻合较好，但在磁暴结束时与观测结果的吻合程度较低。
By using data from multiple instruments, we investigate ionospheric/thermospheric behavior during the period from 21 to 23 June 2015, when three interplanetary shocks (IS) of different intensities arrived at Earth. The first IS was registered at 16:45 UT on 21 June and caused ~50 nT increase in the SYM‐H index. The second IS arrived at 5:45 UT on 22 June and induced an enhancement of the auroral/substorm activity that led to rapid increase of thermospheric neutral mass density and ionospheric vertical total electron content at high latitudes. Several hours later, topside electron content and electron density increased at low latitudes on the nightside. The third and much larger IS arrived at 18:30 UT on 22 June and initiated a major geomagnetic storm that lasted for many hours. The storm provoked significant effects in the thermosphere and ionosphere on both dayside and nightside. In the thermosphere, the dayside neutral mass density exceeded the quiet time levels by 300–500%, with stronger effects in the summer hemisphere. In the ionosphere, both positive and negative storm effects were observed on both dayside and nightside. We compared the ionospheric observations with simulations by the coupled Sami3 is Also a Model of the Ionosphere/Rice Convection Model (SAMI3/RCM) model. We find rather good agreement between the data and the model for the first phase of the storm, when the prompt penetration electric field (PPEF) was the principal driver. At the end of the storm main phase, when the ionospheric effects were, most likely, driven by a combination of PPEF and thermospheric winds, the modeling results agree less with the observations. We analyze global ionospheric/thermospheric effects of geomagnetic disturbances (substorms and major storm) occurred on 22‐23 June 2015 The storm caused quite significant effects in the ionosphere and thermosphere on both dayside and nightside SAMI3/RCM model shows rather good agreement with observations at the first stage of the storm, but less agreement is found at the end of the storm