Analysis of ionosphere response during high-speed solar wind stream in early August 2020

Ionosphere parameters obtained from International Global Navigation Satellite System (GNSS) Service (IGS) stations and SWARM satellites were used to analyze ionosphere response during high-speed solar wind stream (HSSWS) in early August 2020. The ionosphere total electron content (TEC) and the rate of TEC index (ROTI) were calculated from August 1 to 8 2020. The ionosphere parameters in different regions showed an abnormal increase or decrease, but latitude differences were observed and different types of data had different characteristics of abnormal changes. ROTI values in high-latitude areas were six times that in low-latitude areas, and the occurrence rate of ROTI>0.5 reached approximately 54%. The electron density of the topside ionosphere increased by up to 15% during HSSWS. The most affected area was the European–African continent, and the electron density increased by approximately 104%. SWARM TEC also produced a large disturbance, and ROTI reached a peak of 1.77 TECU/min. In addition, ionosonde data were used to detect TEC changes of the lower ionosphere of the F2 layer. Results show that the positive and negative disturbances of the TEC and foF2 parameters existed. The disturbance of ionosonde TEC became considerably larger when the GNSS TEC increased.