Features of the ionosphere storm on December 21—24, 2016
| Katsko, SV, Emelyanov, LY, 1Chernogor, LF 1V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2021, 37(2):57-74 |
| https://doi.org/10.15407/kfnt2021.02.057 |
| Start Page: Dynamics and Physics of Solar System Bodies |
| Язык: Ukrainian |
Аннотация: The aim of this research work is investigation the F region and topside ionosphere response to the moderate geomagnetic storm on December 21, 2016 (Kр max = 6). The subject of the study is the altitude-temporal variations in the parameters of the ionospheric plasma over Kharkiv. The experimental data were obtained by the methods of vertical sounding and incoherent scatter of radio waves with the use of ionosonde and incoherent scatter radar. The study results are based on a correlation analysis of the incoherent scatter signal. The ion and electron temperatures and the ionospheric plasma drift velocity were determined from the set of measured correlation functions of the incoherent scatter signal. To calculate the electron density, we used the power of the incoherent scatter signal, ion and electron temperatures, which were measured for a number of ionosphere heights, and the ionospheric F region peak electron density calculated from the critical frequency measured by the ionosonde. The moderate geomagnetic storm over Kharkiv was accompanied by the iono-sphere storm with sign-variable phases (the first positive phase and the second negative one). The maximum increase of electron density was 1.8 times, and its decrease was 3.4 times accordingly. The negative phase was accompanied by a small the F2 layer peak increase (by 20...28 km) as a result of the decrease of the plasma vertical drift velocity and the increase of electron temperature by 600...800 K and ion temperature by 100...160 K. The effects of strong negative ionospheric disturbances were registered in a period of the next magnetospheric disturbance on December 22—24, 2016 with the F2 layer peak electron density decrease to 2.5...4.9 times. The effects of negative perturbations were manifested in variations of the electron and ion temperatures. Generally, the moderate magnetic storm has caused considerable changes in variations of the F2 layer peak electron density, which were accompanied by ionosphere plasma heating. Variations of the ionospheric plasma vertical drift velocity and the F2 layer peak height were changed during the main phase of magnetic storm. |
| Ключевые слова: electron and ion temperatures, electron density, geomagnetic storm, incoherent scatter radar, ionosonde, ionospheric storm, plasma drift velocity, positive and negative storm phases, space weather |
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