A very faint short-lived cone of deep blue light sometimes observed in the upper atmosphere above an intense thunderstorm.
- They have been correlated with lightning strikes and may be related to visible phenomena that occur in the upper atmosphere over thunderstorms, such as red sprites and blue jets.
- Occurring in the middle of the atmosphere, red sprites look like the stems of carrots, while blue jets are small streaks of light with flared ends like the horn of trumpet.
- They found themselves battered by intense hail inside a thunderstorm and witnessing not sprites - but blue jets.
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