こう高度 こうど放電 ほうでん発光 はっこうじゃありません
kō kōdohōdenhakkōjārimasen

Noun
Desu Copula
Negation Auxiliary

The polite negative form of 高高度放電発光

1. It is not high-altitude discharge luminescence.; It's not a high-altitude discharge phenomenon.

Negative
Polite
Terminal Form