"1" . . "2018-05-29 16:57:01.0" . "false" . "1" . "2018-05-29 16:57:01.0" . "SDN:P07::J95ROWAH" . . . "frequency_of_lightning_flashes_per_unit_area"@en . "SDN:P07::J95ROWAH" . "accepted"@en . . "SDN:P07::J95ROWAH" . "" . . . "A lightning flash is a compound event, usually consisting of several discharges. Frequency is the number of oscillations of a wave, or the number of occurrences of an event, per unit time."@en .