The Contribution of Geomagnetic Activity to Ionospheric foF2 Trends at Different Phases of the Solar Cycle by SWM

The Contribution of Geomagnetic Activity to Ionospheric foF2 Trends at Different Phases of the Solar Cycle by SWM
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SWM 太阳周期不同阶段地磁活动对电离层 foF2 趋势的贡献

DOI:
10.3390/atmos11060616
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发表时间:
2020-06
期刊:
影响因子:
2.9
通讯作者:
Lianqi Xie
Lianqi Xie
中科院分区:
地球科学4区
文献类型:
--
作者:
Haimeng Li;Jing-Song Wang;Zhou Chen;Lianqi Xie

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太阳活动主导着电离层属性的时间变异性,这使得识别和隔离地磁活动对电离层的影响变得困难。因此,后一种对电离层的影响仍不清楚。在这里,我们使用频谱白化法(SWM)--一种被证明是提取地磁活动引起的电离层扰动的方法--来孤立地直接获得地磁活动的影响。我们研究了它在太阳周期的不同阶段对电离层的贡献。太阳活动和地磁活动之间的时间间隔为了解地磁活动对电离层扰动的贡献提供了机会。结果表明,地磁活动最大时对电离层的贡献很大,这种贡献通常发生在太阳活动周期的衰退期,而在太阳活动的极小期和上升期,这种贡献很小。然后,通过分析不同月份的贡献,我们发现地磁活动在冬季附近的作用较大,而在夏季附近的作用较小。
Solar activity dominates the temporal variability of ionospheric properties, which makes it difficult to identify and isolate the effects of geomagnetic activity on the ionosphere. Therefore, the latter effects on the ionosphere are still unclear. Here, we use the spectral whitening method (SWM)—a proven approach to extract ionospheric perturbations caused by geomagnetic activity—to directly obtain, in isolation, the effects of geomagnetic activity. We study its contribution to the ionosphere for different phases of the solar cycle. The time lag between the solar and geomagnetic activities provides an opportunity to understand the contribution of geomagnetic activity to the perturbation of the ionosphere. The results suggest that this contribution to the ionosphere is significant when geomagnetic activity is at its maximum level, which usually happens in the declining phase of the solar cycle, but the contribution is very weak at the solar minimum and during the ascending phase. Then, by analyzing the contributions in different months, we find that the role of geomagnetic activity is larger around winter but smaller around summer.
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