Abstract

In this paper, we study electron loss rate resulting from recombination processes in the upper part of the ionospheric D-region after being influenced by a solar X-ray flare activity. We analyse the altitude and time dependences of the governing plasma electron loss rate and its spatial and temporal derivatives. The presented numerical modelling is based on data recorded through remote sensing of the lower ionosphere utilizing the reflected very low-frequency radio signal emitted by the DHO transmitter in Germany and received in Belgrade, Serbia. Ionospheric parameters were calculated by a procedure based on a comparison of the observed changes in the signal amplitude and phase with their values modelled by the Long-Wave Propagation Capability numerical model. We consider the time period after influence of the solar X-ray flare of the class C8.8 occurred on 5 May, 2010 between 11:37 UT and 11:58 UT with the maximum at 11:52 UT. Due to the same tendencies of the D-region plasma parameters variation, the obtained conclusions can be extended and generalized to any solar X-ray flare.

Graphic Abstract)

中文翻译：

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太阳X射线耀斑后由于电离层D区上部等离子体中的复合过程导致的电子损失率变化：一个研究案例

摘要

在本文中，我们研究了受到太阳X射线耀斑活动影响后电离层D区上部的重组过程所导致的电子损失率。我们分析了控制等离子体电子损失率及其时空导数的高度和时间依赖性。提出的数值模型基于通过利用德国DHO发射器发射并在塞尔维亚贝尔格莱德接收到的反射的非常低频无线电信号对下部电离层进行遥感记录的数据。电离层参数是通过将观测到的信号幅度和相位变化与通过长波传播能力数值模型建模的值进行比较的程序计算得出的。我们考虑C8类太阳X射线耀斑影响后的时间段。8个事件发生在2010年5月5日UT 11:37到11:58 UT之间，最大值发生在UT 11:52。由于D区域等离子体参数变化的趋势相同，因此可以将获得的结论扩展并推广到任何太阳X射线耀斑。

图形摘要）