Findings of the unusual plasma bubble occurrences at dawn during the recovery phase of a moderate geomagnetic storm over the Brazilian sector

Author(s)

Carmo, C. S. ; Denardini, C. M. ; Figueiredo, C. A. O. B. ; Resende, L. C. A. ; Moro, J. ; Silva, R. P. ; Nogueira, P. A. B. ; Chen, S. S. ; Picanco, G. A. S. ; Neto, P. F. Barbosa

• Document type: Journal article
• Source: JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS; v. 235, p. 9-pg., 2022-09-01.

Abstract

In this work, we observe for the first time the unusual pre-sunrise Equatorial Plasma Bubbles (EPBs) during a moderate geomagnetic storm recovery phase caused by the High-Speed Solar Wind Stream (HSS) on February 17, 2015, over the Brazilian sector. Therefore, this study aims to explain the generation mechanism of this uncommon event, which started at 08:00 UT on February 18, 2015. We used Multiple Global Navigation Satellite Systems (Multi-GNSS, GPS, and GLONASS) data to produce two-dimensional maps of the Rate Of TEC index (ROTI) that show EPB features elongated in magnetic meridians. Also, Digisonde data from Sa similar to o Luis (2.53 degrees S, 44.30 degrees W, dip angle: 8.57 degrees), Boa Vista (12.81 degrees N, 60.67 degrees W, dip angle: 33.71 degrees), and Campo Grande (20.44 degrees S, 54.64 degrees W, dip angle: 25.98 degrees), and magnetometer data at Sa similar to o Luis and Euse ' bio (3.89 degrees S, 38.45 degrees W, dip angle: 17.96 degrees). Our analysis shows that the unusual pre-sunrise plasma bubbles lasted longer after sunrise, around 1 h. Finally, we showed that these EPBs are likely driven by a disturbance wind dynamo effect, which helps to understand the role of the external factors in EPBs development. (AU)

• FAPESP's process: 18/09066-8 - TRAVELLING IONOSPHERIC DISTURBANCES OBSERVED BY DETRENDED TOTAL ELECTRON CONTENT MAPS/KEOGRAM OVER ANDES MOUNTAINS
• Grantee: Cosme Alexandre Oliveira Barros Figueiredo
• Support Opportunities: Scholarships in Brazil - Post-Doctoral