NASA | Fermi Helps Scientists Study Gamma-ray Thunderstorms

The video discusses terrestrial gamma ray flashes (TGFs), which are high-energy radiation events occurring naturally on Earth. NASA's Fermi Gamma Ray Space Telescope detects about 1100 TGFs daily. Recent research combines Fermi data with ground-based radar and lightning data, revealing TGFs originate from diverse storm types. Lightning within clouds can accelerate electrons, producing gamma rays. TGFs are more common than previously thought, but many go undetected due to atmospheric weakening. Understanding TGFs can enhance knowledge of Earth's natural particle accelerators.

What is the frequency of terrestrial gamma ray flashes as detected by NASA's Fermi Gamma Ray Space Telescope?

• About 2000 times a day

• About 1500 times a day

• About 1100 times a day

• About 500 times a day

What causes the different parts of a thunderstorm cloud to develop electrical charges?

• Sunlight exposure

• Collisions among rain and snow

• Temperature changes

• Wind speed variations

How do accelerated electrons in a thunderstorm produce gamma rays?

• By being deflected by air molecules

• By interacting with sunlight

• By reaching the ground

• By colliding with other electrons

At what altitude range do TGFs most commonly occur?

• Between 3 and 5 miles high

• Between 9 and 11 miles high

• Between 5 and 7 miles high

• Between 7 and 9 miles high

Why might TGFs be more common than currently detected?

• They are blocked by clouds

• They are only detected over oceans

• They are too dim to be detected at lower altitudes

• They occur only during the day