Statistical analysis on the ionospheric response over South American mid- and near high-latitudes during 70 intense geomagnetic storms occurred in the period of two decades

de Abreu A.J.; Correia E.; de Jesus R.; Venkatesh K.; Macho E.P.; Roberto M.; Fagundes P.R.; Gende M.

Statistical analysis on the ionospheric response over South American mid- and near high-latitudes during 70 intense geomagnetic storms occurred in the period of two decades

Tipo

Artigo

Data de publicação

2023

Periódico

Journal of Atmospheric and Solar-Terrestrial Physics

Citações (Scopus)

3

Autores

de Abreu A.J.
Correia E.
de Jesus R.
Venkatesh K.
Macho E.P.
Roberto M.
Fagundes P.R.
Gende M.

Resumo

© 2023 Elsevier LtdThe first-time statistical response of the positive and negative ionospheric storms phases using Vertical Total Electron Content (VTEC) measurements during 70 geomagnetic storms at near high- and mid-latitudes regions in the Antarctic and Argentine/Chilean sectors in the Southern hemisphere are investigated. The study covers the years between 1999 and 2018 of solar cycles 23 and 24, using the Dst ≤ −100 nT as a criterion for all 70 storms selected. Significant features of solar cycle, seasonal and local time of ionospheric storms are showed. Our results indicate that the occurrence of geomagnetic storms follows a pattern of solar activity dependence, and also indicate a predominance of positive and positive-negative phases during autumn, winter, and spring at mid-latitudes and winter at near high-latitudes. Negative and negative-positive phases occur during all seasons at near high- and mid-latitudes. In addition, positive phases occur more frequently during the daytime while the negative phases occur predominantly in nighttime. There is also a predominance of positive and positive-negative phases simultaneously at near high- and mid-latitudes in the Antarctic and Argentine/Chilean sectors. The percentages of occurrence of positive and positive-negative phases are of 50% and 19%, respectively, at mid-latitude and 60% and 22%, respectively, at near high-latitudes. Negative and negative-positive phases are below 9% at both latitudes.

Assuntos Scopus

Antarctic sector , Geomagnetic storm , GPS TEC , Gps-tec , High Latitudes , Ionospheric storm , Midlatitudes , Negative phase , Positive/negative , Solar cycle