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Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Day-to-day and short-term variabilities in the equatorial plasma bubble/spread F irregularity seeding and development

Fig. 8

Variations during 17–18 March 2015 (intense storm) plotted in panels from top to bottom in: (1) F region vertical drift over Fortaleza obtained as dhF/dt at plasma frequencies 6 MHz, 7 MHz, and 8 MHz (top panel); (2) the vertical drift obtained as mean of the drift at the same three plasma frequencies on 16 March, a quiet day, as reference (panel 2); (3) spread F intensity represented by the fop parameter (the top frequency of the range spreading F trace (panel 3); (4) the difference between the hmF2 values at the conjugate Digisonde stations, Campo Grande, and Boa Vista, denoted as hmF2(CG)–hmF2(BV), or dhmF2(CG − BV), marked only as dhmF2 on the y-axis as dhmF2 (panel 4); the auroral Activity index AE (panel 5); and the Sym-H representing 1-min Dst values (bottom panel). Note that the Vz reference curve of 16 March is repeated on two days in the second panel, whereas all other plots cover two running days, 17–18 March

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