Researchers flew NASA's ER-2 aircraft as close to thunderclouds as safely possible and captured 'the most detailed' data of gamma-rays and thunderclouds ever recorded through airborne analysis.

NASA flew a modified U-2 spy plane into thunderstorms to study super-energetic gamma-rays

Source: space
Source Link: https://www.space.com/nasa-thunderstorms-gamma-rays-er-2-aircraft