Fig. 4From: Ionospheric irregularity behavior during the September 6–10, 2017 magnetic storm over Brazilian equatorial–low latitudesVertical (a) and zonal (b) plasma drift components over São Luís inferred by Digisonde data for the nights 03/04, 05/06 and 07/08, which are positive upwards and eastwards, respectively. The measurement error bars are represented for each 10 minBack to article page