高こう高こう度ど放ほう電でん発はっ光こう

Meanings

transient luminous event

Technical term in atmospheric physics for brief optical phenomena above thunderstorms, such as sprites, elves, and blue jets.

高こう高こう度ど放ほう電でん発はっ光こうは雷らい雲うんの上じょう空くうで観かん測そくされる。
Transient luminous events are observed above thunderclouds.
スプライトは高こう高こう度ど放ほう電でん発はっ光こうの一いっ種しゅである。
Sprites are a type of transient luminous event.

Kanji

高tall, high, expensive
度degrees, occurrence, time
放set free, release, fire
電electricity
発departure, discharge, publish
光ray, light

Related words

スプライト
A specific type of transient luminous event; 高高度放電発光 is the broader category.
雷かみなり放ほう電でん
Refers to lightning discharge in general, not specifically the high-altitude optical phenomena.

Built from

高こう高こう度ど+放ほう電でん+発はっ光こう

Written forms

高こう高こう度ど放ほう電でん発はっ光こう
Standard kanji spelling for this technical term.
高こう々こう度ど放ほう電でん発はっ光こう
Variant spelling using 々 for repetition; less common but still seen in technical contexts.

Etymology

Compound of 高高度 (high altitude), 放電 (electric discharge), and 発光 (luminescence). The term is a direct translation of the English 'transient luminous event' and is used primarily in scientific literature.