[:ja]宇宙飛行士がISSから撮影したアラビア半島の稲妻です。クウェートとサウジアラビアが映っています。
大気中では稲妻は毎秒50回ほど光り、1日に430万回、年間15億回になります。2013年8月に打ち上げられたガンマ線観測機一式により、2018年10月にインドネシアのスラウェシ島の東で発生した雷雲の中で、稲妻がガンマ線の閃光を発生させるのを観測しています。これは｢Terrestrial gamma-ray flash（地上ガンマ線フラッシュ）｣または略してTGFと、雷雨に関連する大気中の光学現象で、電離層放射の薄暗い円盤である｢Elve（エルヴ）｣（超高層雷放電）の可視光成分の両方を初めて捉えたものとなっています。
参考文献： Sensing Lightning from the Space Station (NASA Earth Observatory)
地球俯瞰画像を見る： LiVEARTH
[Earthview Wonders] No.990: Lightning Over Arabian Peninsula🇰🇼🇸🇦
Astronaut on board ISS captured the lightning over Arabian Peninsula, between Kuwait and Saudi Arabia.
Across the atmosphere of Earth, lightning flashes about 50 times per second which is 4.3 million times a day and roughly 1.5 billion times a year. Launched to the ISS in August 2013, the Firestation instrument includes photometers to measure lightning flashes, radio antennas to measure the static, and a gamma-ray electron detector. On Oct. 10, 2018, a suite of instruments on ISS observed as the bolt produced a flash of gamma radiation—and, simultaneously, emitted a glowing ring of ultraviolet and visible light in the topmost layer of the atmosphere.
Reference: Sensing Lightning from the Space Station (NASA Earth Observatory)
See earthview photo gallery: LiVEARTH[:en][Earthview Wonders] No.990: Lightning Over Arabian Peninsula🇰🇼🇸🇦
Astronaut on board ISS captured the lightning over Arabian Peninsula, between Kuwait and Saudi Arabia.
Across the atmosphere of Earth, lightning flashes about 50 times per second which is 4.3 million times a day and roughly 1.5 billion times a year. Launched to the ISS in August 2013, the Firestation instrument includes photometers to measure lightning flashes, radio antennas to measure the static, and a gamma-ray electron detector. On Oct. 10, 2018, a suite of instruments on ISS observed as the bolt produced a flash of gamma radiation—and, simultaneously, emitted a glowing ring of ultraviolet and visible light in the topmost layer of the atmosphere.
Reference: Sensing Lightning from the Space Station (NASA Earth Observatory)
See earthview photo gallery: LiVEARTH[:]