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

Author(s)

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

• Document type: Journal article
• Source: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 245, p. 13-pg., 2023-04-01.

Abstract

The 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. (AU)

• FAPESP's process: 16/24970-7 - The Scintillation Prediction Observation Research Task (SPORT)
• Grantee: Mangalathayil Ali Abdu
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 19/05455-2 - Characterization of the ionospheric dynamics in the South American sector and Antarctica under the space weather conditions
• Grantee: Emilia Correia
• Support Opportunities: Regular Research Grants