こう高度 こうど放電 ほうでん発光 はっこうじゃなかったです
kō kōdohōdenhakkōjanakattadesu

Noun
Desu Copula

The polite, past negative form of 高高度放電発光

1. Wasn't high-altitude discharge luminescence.; Wasn't a high-altitude discharge glow.

Past/Perfective
Negative
Polite
Casual Register