valuation of Different Methods for Calculating the ROTI Index Over the Brazilian Secto

Autor(es)

Carmo, C. S. ^[1] ; Denardini, C. M. ^[1] ; Figueiredo, C. A. O. B. ^[1] ; Resende, L. C. A. ^{[1, 2]} ; Picanco, G. A. S. ^[1] ; Neto, P. F. Barbosa ^{[1, 3]} ; Nogueira, P. A. B. ^[4] ; Moro, J. ^{[2, 5]} ; Chen, S. S. ^[1]

Afiliação do(s) autor(es)

^[1] Natl Inst Space Res INPE, Sao Jose Dos Campos - Brazil

^[2] State Key Lab Space Weather NSSC CAS, Beijing - Peoples R China

^[3] Salesian Univ Ctr Sao Paulo, Lorena - Brazil

^[4] Fed Inst Educ Sci & Technol Sao Paulo IFSP, Jacarei - Brazil

^[5] Southern Space Coordinat COESU INPE, Santa Maria, RS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: RADIO SCIENCE; v. 56, n. 8 AUG 2021.
• Citações Web of Science: 1

Resumo

Ionospheric irregularities as plasma bubbles occur in the ionosphere, and generally, they are characterized by the low plasma density regions. The Rate Of TEC Index (ROTI) was defined in terms of the Total Electron Content (TEC) variation and is used to characterize these plasma bubbles. It is essential to evaluate the ROTI behavior since the ionospheric irregularities can cause fluctuations in the radio signal, interfering in the ionospheric data analysis. Therefore, we performed in this work a comparative study of five different methods available to calculate the ROTI to evaluate the most suitable over the Brazilian region. The ROTI was calculated over three GNSS stations at different latitudes: Sao Luis (SALU, 2 degrees 31 ` S, 44 degrees 16 ` W; dip: -3.8 degrees), Cachoeira Paulista (CHPI, 22 degrees 40'S, 44 degrees 59'W; dip: -36.4 degrees), and Santa Maria (SMAR, 29 degrees 41 ` S, 53 degrees 48 ` W, dip: -37 degrees). The results show that the most viable method for calculating ROTI in the Brazilian region is based on the Slant TEC equation as defined by Cherniak et al. (2018), . Our results are supported by the comparison between the ROTI with TEC maps, ionograms collected at Fortaleza (FZA0M, 3 degrees 43'S, 38 degrees 32'W, dip: -15.8 degrees), SALU, and CHPI and All-Sky imagers collected at the Sao Joao do Cariri (SJCA, 7 degrees 23'S, 36 degrees 31'W, dip: -11 degrees) and CHPI. Additionally, we observe Equatorial Plasma Bubbles (EPBs) in the Brazilian region using the ROTI index map. (AU)

• Processo FAPESP: 18/09066-8 - Distúrbios ionosféricos propagantes observados sobre a cordilheira dos andes utilizando mapas/keogramas de conteúdo eletrônico total perturbado
• Beneficiário: Cosme Alexandre Oliveira Barros Figueiredo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado