Abstract

The purpose of this work is to investigate the response of the F region and topside ionosphere to the moderate geomagnetic storm on December 21, 2016 (K_{p max} = 6). The subject of the study is the height–time variations in the parameters of the ionospheric plasma over Kharkiv. Experimental data were obtained using vertical sounding and incoherent scatter methods by the ionosonde and incoherent scatter radar. The presented results are based on the correlation analysis of the incoherent scattered signal. The ion and electron temperatures, as well as the ionospheric plasma velocity, were determined from a set of measured correlation functions of the incoherently scattered signal. The electron density was calculated using the following parameters measured for a number of ionospheric heights: power of the incoherent scatter signal, ion and electron temperatures, and the electron density at the ionospheric F2 layer peak, which is calculated from the critical frequency measured by the ionosonde. The moderate geomagnetic storm was accompanied by an ionospheric storm over Kharkiv with sign-variable phases (first positive and second negative). The peak increase in the electron density was 1.8 times and decrease was 3.4 times. The negative phase was accompanied by a slight rise of the F2 layer (by 20–28 km), which could be due to a decrease in the vertical component of the plasma velocity and an increase in the electron temperature by 600–800 K and ion temperature by 100–160 K. Effects of strong negative ionospheric disturbances were registered during the subsequent magnetospheric disturbance of December 22–24, 2016, with a decrease in electron density at the F2 layer peak up to 2.5–4.9 times. The effects of negative disturbances manifested themselves in the variations of temperatures of electrons and ions. In general, the moderate magnetic storm caused significant changes in the electron density in the ionospheric F2 layer peak, which were accompanied by heating of the ionospheric plasma as well as changes in variations of the vertical component of the ionospheric plasma velocity and the height of ionization during the main phase of the magnetic storm.

中文翻译：

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2016年12月21日至24日的电离层风暴的特征

摘要

这项工作的目的是调查2016年12月21日F区域和上层电离层对中等地磁风暴的响应（K _{p max}  = 6）。该研究的主题是哈尔科夫地区电离层等离子体参数的高度-时间变化。通过离子探空仪和非相干散射雷达，使用垂直探测和非相干散射方法获得了实验数据。给出的结果基于对非相干散射信号的相关性分析。离子和电子温度以及电离层等离子体速度是根据非相干散射信号的一组测得的相关函数确定的。电子密度是使用以下参数针对多个电离层高度测得的：非相干散射信号的功率，离子和电子温度，以及电离层F2层峰值处的电子密度，这是根据由电离层F2测得的临界频率计算得出的。离子探空仪。中度地磁风暴伴随着哈尔科夫上空的电离层风暴，其相位具有符号可变的相位（第一个正向和第二个负向）。电子密度的峰值增加是1.8倍，减少是3.4倍。负相伴随着F2层的轻微升高（增加了20-28 km），这可能是由于等离子体速度的垂直分量降低以及电子温度升高了600-800 K和离子温度升高了100–160K。在随后的2016年12月22日至24日发生的磁层扰动期间，记录到了强烈的电离层负扰动，F2层峰值的电子密度下降了2.5–4.9倍。负扰动的影响表现在电子和离子温度的变化中。一般来说，