Variation characteristics of ionospheric electron density and plasma temperature at high latitudes in winter of high solar activity

Abstract

Based on the detected data from European Svalbard Incoherent Scatter Radar(ESR), the characteristics of electron density and electron and ion temperature in the ionospheric 200 ~ 450 km are analyzed and compared with the values calculated by the empirical model of incoherent scatter radar. Found that more than 200 km and ionospheric electron and ion temperature with height and the tendency of the world is very consistent, there are two in the morning and afternoon peak and valley value lower in the afternoon, evening and night increase. In general, the maximum electron temperature occurs at 6:00-7:00 UT (about 2500 K) in the morning, and the minimum occurs at 17:00-19:00UT (about 1000 K) in the evening, which is different from the characteristics of ionospheric plasma parameters in middle and low latitudes. Comparing the measured electron temperature with ESR empirical model, the variation trend of electron and ion temperature is basically consistent. However, firstly, there are some differences in the peak time of electron and ion temperature and electron density. Secondly, the diurnal and height variation of the empirical model values are more significant. By analyzing the correlation between electron temperature and electron density, it is found that under the influence of strong solar activity, the generally accepted relationship between electron temperature and electron density is only established in winter. The above results enhance the understanding of the characteristic variation of ionospheric plasma parameters in high latitudes and contribute to a deeper understanding of the characteristics of ionospheric variation.