Fig.1

Site locations that provide plasma drift velocity, h’f data, where the BOA vista site also provides ionospheric scintillation index S4"

Fig.2

Geomagnetic indices between November 19 and November 26, 2020 (The yellow background represents the period from November 22 00:00 UT to November 23 00:00 UT)"

Fig.3

OI 135.6nm radiance map observed in successive disk scan of GOLD/UV nighttime imaging between 23:10 and 00:25 UT on November 21 to 23, 2020 (The scatter data in the figure is VTEC data from the Madrigal database LOS)"

Fig.4

2D TEC maps of the South America region during 22:10-23:50 UT, November 21 to 23, 2020, at 20-minute intervals, with the black line representing the geomagnetic equator, and interpolated for a region (30°S—10°N, 30°W—70°W) to facilitate better imaging of the EPB"

Fig.5

S4 index for the BOA VISTA and SAO LUIS stations in November 2020 (The blue dots in the figure represent all available satellite data)"

Fig.6

ROTI maps from November 21 to November 23, 2020 (The ROTI maps (a1)—(a6), (b1)—(b6), and (c1)—(c6) depict ionospheric irregularities for 21, 22 and 23 November, 2020, respectively)"

Fig.7

Polar ROTI maps from November 21 to November 23, 2020 (The maps include three time points: 1:35, 16:35, and 19:35, corresponding to the times of post-midnight EPB period, the period without EPBs during the day, and the time period around PRE enhancement)"

Fig.8

Ne profiles at similar times on November 21 to 23, 2020 from swarm satellites (left panel) and the corresponding orbit tracks at the position over South America (right panel) (The black, green, and blue lines represent the orbits of swarm A, B, and C, respectively, and the red fluorescence indicates the occurrence of ionospheric irregularities with ROTI>0.4)"

Fig.9

Temporal variation of h’f provided by the BOA VISTA, FORTALEZA, and SAO LUIS sites during November (The dashed line indicates the multi-day average of h’f, and the red line represents the h’f value on November 22 to 23, where the yellow background contains the time period of EPB suppression)"

Fig.10

Vertical, meridional, and zonal drift velocities provided by the BOA VISTA, FORTALEZA, and SAO LUIS stations for November 21 to 23 (The vertical straight lines represent error lines and the sunrise and sunset time points are marked below the central panel)"