KOEN, Etienne J.; COLLIER, Andrew B. Mid-latitude ionospheric signature of a weak solar flare in winter. South African Journal of Science, [S. l.], v. 109, n. 1/2, p. 5, 2013. DOI: 10.1590/sajs.2013/802. Disponível em: https://sajs.co.za/article/view/4142. Acesso em: 28 apr. 2024.