Ionosphere D-layer lowering in the region of the South Atlantic Magnetic Anomaly

Magalhaes A.A.S.; Guerche G.; Raulin J.-P.

Ionosphere D-layer lowering in the region of the South Atlantic Magnetic Anomaly

Tipo

Artigo

Data de publicação

2019

Periódico

Journal of Atmospheric and Solar-Terrestrial Physics

Citações (Scopus)

0

Autores

Magalhaes A.A.S.
Guerche G.
Raulin J.-P.

Resumo

© 2019 Elsevier LtdIn this paper we analyse the effects of 25 solar flare events over long VLF propagation paths, one of them with the very remarkable property of crossing nearly the centre with the lowest magnetic field intensity in the South Atlantic Magnetic Anomaly (SAMA). The phase of the VLF transmitter signal (NPM: 21.4 kHz) on Lualualei, Hawaii, was recorded at the stations Punta Lobos (PLO, Peru) and Atibaia (ATI, Brazil) between 2007 March and 2011 September. Both paths NPM-PLO and NPM-ATI are collinear, and the comparison of the recorded phases suggests a descent of the lower ionosphere quiescent reflection height, possibly associated with the weakening of the Earth magnetic field in the SAMA region.

Assuntos Scopus

Earth magnetic fields , Lower ionosphere , Magnetic-field intensity , Solar flare , South Atlantic magnetic anomaly , Transmitter signals , VLF propagation