こう高度 こうど放電 ほうでん発光 はっこうだったら
kō kōdohōdenhakkōdattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 高高度放電発光

1. If it were high-altitude discharge luminescence; If high-altitude discharge luminescence occurred

Tara Conditional