Open AccessBackscattering dynamics during intense geomagnetic storm as deduced from Yekaterinburg radar data: March 17–22, 2015
Author(s) -
Н. А. Золотухина,
Н. А. Золотухина,
V. I. Kurkin,
V. I. Kurkin,
Н. М. Полех,
Н. М. Полех,
Елена Романова,
Елена Романова
Publication year - 2017
Publication title -
solar-terrestrial physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.11
H-Index - 2
ISSN - 2500-0535
DOI - 10.12737/24272
Subject(s) - ionosphere , radar , geomagnetic storm , earth's magnetic field , storm , incoherent scatter , scattering , backscatter (email) , geophysics , geology , physics , remote sensing , meteorology , magnetic field , optics , telecommunications , computer science , quantum mechanics , wireless
This paper examines the spatio-temporal dynamics of backscattering signals during St. Patrick’s Day two-step intense geomagnetic storm from the Yekaterinburg Coherent Radar (YeKB radar) data. It is found that a number of ground backscattering signals increased during the initial phase of the storm and decreased during the second step of its main phase and the first two days of its recovery phase. Changes in ionospheric backscattering signals started at the beginning of the main phase. During the first step, there was a six-hour sequence of ionospheric backscattering signals (BSi signals) the range of which decreased while the storm was in progress. During the last 5 hours of the main phase and the first 3 hours of the recovery phase, the YeKB radar observed only signals scattering in the E region of the ionosphere. We conduct a complex analysis of data from the YeKB radar, ground-based ionospheric, riometric, and magnetic stations located within the radar field of view. The analysis shows that the observed backscattering dynamics was caused by the magnetosphere compression, expansion of convection cells, impact ionization, and changes in atmospheric composition during the initial storm phase, first and second steps of the main phase, and the recovery phase respectively.