high altitude
Refers to a great height above ground or sea level, often used in technical or aviation contexts.
その飛行機は高高度を飛行している。
The airplane is flying at a high altitude.
high-altitude flying
transient luminous event
Standard kanji spelling.
Rare variant using the iteration mark 々.
Compound of 高 (こう, 'high') and 高度 (こうど, 'altitude').