Ionospheric response on geomagnetic storms for near high- and mid-latitudes in South America

M. GENDE; A. J. DE ABREU; CORREIA, E.; DE JESUS, R.; VENKATESH, K.; MACHO, E.P.; ROBERTO, M.; FAGUNDES, P. R.

Ushuaia

Workshop; Space Weather Observations throughout Latinoamerica; 2023

UNLP - CONAE - NASA

The geomagnetic storms that occurred during the last two decades will be analyzed regarding their impact on the ionosphere for latitudes that cover Antarctica, and the southern parts of Argentina and Chile. The Dstindex will be used as a criteria for selecting disturbed time periods, Vertical Total Electron Content derived from ve CORS GNSS receivers with long historical records will characterize the ionospheric behavior.This study shows increasing plasma density changes, when compared to mean values obtained during geomagnetically quiet periods, that have a preponderance during autumn, winter, and spring at mid- latitudes and inwinter at near high-latitudes. These positive changes are observed more frequently during daytime. On the other hand, decreasing plasma density changes do not present a seasonal pattern for any latitude sector andthey occur predominantly at nighttime. A pattern of solar activity dependence of the geomagnetic storms was also found. Results achieved from this study will contribute to a better understanding of the space weather in the upper Antarctic atmosphere.