Preprints
https://doi.org/10.5194/angeo-2021-61
https://doi.org/10.5194/angeo-2021-61

  28 Oct 2021

28 Oct 2021

Review status: this preprint is currently under review for the journal ANGEO.

A multi-instrumental and modelling analysis of the ionospheric responses to the solar eclipse of December 14, 2020, over the Brazilian region

Laysa Cristina Araujo Resende1,2, Yajun Zhu1, Clezio Marcos Denardini2, Sony Su Chen2, Ronan Arraes Jardim Chagas2, Lígia Alves Da Silva1,2, Carolina S. Carmo2, Juliano Moro1,3, Diego Barros2, Paulo Alexandre Bronzato Nogueira4, José Paulo Marchezi1,2, Giorgio A. S. Picanço2, Paulo Jauer1,2, Régia Pereira Silva1,2, Douglas Silva1,2, José Alexander Carrasco2, Chi Wang1, and Zhengkuan Liu1 Laysa Cristina Araujo Resende et al.
  • 1State Key Laboratory of Space Weather, Beijing, China
  • 2National Institute for Space Research – INPE, São José dos Campos-SP, Brazil
  • 3Southern Space Coordination - COESU, Santa Maria-RS, Brazil
  • 4Instituto Federal de Educação Ciência e Tecnologia de São Paulo - IFSP, Jacareí, Brazil

Abstract. This work presents an analysis of the ionospheric responses to the solar eclipse that occurred on December 14, 2020, over the Brazilian sector. This event partially covers the south of Brazil, providing an excellent opportunity to study the modifications in the peculiarities that occur in this sector, as the Equatorial Ionization Anomaly (EIA). Therefore, we used the Digisonde data available in this period for two sites, Campo Grande (CG, 20.47° S, 54.60° W, dip ∼23° S) and Cachoeira Paulista (CXP, 22.70° S, 45.01° W, dip ∼35° S), assessing the E, and F regions, and Es layer behaviors. Additionally, a numerical model (MIRE, Portuguese acronym for E Region Ionospheric Model) is used to analyze the E layer dynamics modification around these times. The results show the F1 region disappearance and an apparent electronic density reduction in the E region during the solar eclipse. We also analyzed the total electron content (TEC) maps from the Global Navigation Satellite System (GNSS) that indicate a weakness in the EIA. On the other hand, we observe the rise of the Es layer electron density, which is related to the gravity waves strengthened during solar eclipse events. Finally, our results lead to a better understanding of the restructuring mechanisms in the ionosphere at low latitudes during the solar eclipse events, even though they only partially reached the studied regions.

Laysa Cristina Araujo Resende et al.

Status: open (until 12 Dec 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on angeo-2021-61', Anonymous Referee #1, 26 Nov 2021 reply
  • RC2: 'Comment on angeo-2021-61', Anonymous Referee #2, 30 Nov 2021 reply

Laysa Cristina Araujo Resende et al.

Laysa Cristina Araujo Resende et al.

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Short summary
This study showed the ionospheric response over low latitudes regions in Brazil predicted by Martínez-Ledesma et al. (2020) for the solar eclipse event on December 14, 2020. We used a multi-instrumental and modeling analysis to observe the modifications in the E and F regions and the Es layers over Campo Grande and Cachoeira Paulista. The results showed that solar eclipses can cause significant ionosphere modifications even though they only partially reach the Brazilian low latitude regions.