Quasiperiodic Rising Structures in the E-F Valley Region Below the Equatorial Plasma Bubble: A Numerical Study

Autor(es)

Savio, S. ^{[1, 2, 3]} ; Sousasantos, J. ^[4] ; Pimenta, A. A. ^[2] ; Yang, G. ^{[1, 3]} ; Kherani, E. A. ^[2] ; Wang, C. ^[1] ; Liu, Z. ^{[1, 3]}

Afiliação do(s) autor(es)

^[1] Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing - Peoples R China

^[2] INPE, Aeron Div, Natl Inst Space Res, Sao Jose Dos Campos - Brazil

^[3] NSSC INPE, China Brazil Joint Lab Space Weather, Sao Jose Dos Campos - Brazil

^[4] Technol Inst Aeronaut, ITA, Sao Jose Dos Campos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS; v. 124, n. 8, p. 7247-7255, AUG 2019.
• Citações Web of Science: 0

Resumo

This paper presents a numerical study aiming to understand the generating mechanism of poorly studied equatorial plasma irregularities known as equatorial quasiperiodic echoes. Employing a two-dimensional model of the collisional interchange instability, the simulations are able to reproduce the spatial periodic features of this kind of irregular structures. The usage of an instability seeding source considering an overlap of two gravity waves with different wavelengths was capable to produce such quasiperiodic structures. The results suggest that the penetration of the equatorial plasma bubble fringe fields in typical altitudes of the valley region may be the physical mechanism responsible for the structures. Additionally, the simulation results indicate that the lower wavelength gravity wave dominates over the quasiperiodic nature of the these irregularities. The simulations results present considerable agreement with radar and in situ measurements of these quasiperiodic structures. (AU)

• Processo FAPESP: 18/06158-9 - Estudos estatísticos da variação dos parâmetros ionosféricos e sua relação com eventos do clima espacial
• Beneficiário: Jonas de Sousa dos Santos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado