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All-sky imaging observations of the F-region OI 630nm nightglow emission allow us to\udvisualize large-scale equatorial plasma depletions, generally known as trans-equatorial plasma\udbubbles. Strong range type spread-F is the radio signature of these (magnetically) north-south\udaligned plasma depletions. An extensive database of the OI 630nm emission all-sky imaging\udobservations has been obtained at Cachoeira Paulista (22.7°S, 45.0°W; dip latitude ∼16°S),\udBrazil, between the years 1987 and 2000. An analysis of these observations revealed that\udrelatively few large-scale ionospheric plasma depletions occur during the months of May to\udAugust (southern winter, June solstice) in the Brazilian sector. Of the few that are observed\udduring these months, some occur in association with geomagnetic storms and some do not. In\udthis paper, a detailed analysis of the events when large-scale ionospheric plasma depletions were\udinitiated and evolved during the June solstice periods are presented and discussed.  <b>Key words.</b>\udAtmospheric composition and chemistry (airglow and aurora).\udIonosphere (equatorial ionosphere; ionospheric irregularities

Generation of large-scale equatorial F-region plasma depletions during lowrange spread-F season