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[The Science of the Sky: Understanding Auroras and the Discovery of STEVE]-[An Aurora Named Steve]

Wow in the World · B1 · 2018-08-06

Preschool Enlightenment
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📋 Summary

Exploring the Wonders of the Night Sky: Auroras and STEVE

In this episode of Wow in the World, hosts Mindy and Guy Raz embark on an adventurous journey to Northern Alberta, Canada, to witness one of the most spectacular natural phenomena on Earth: the aurora borealis. Through their enthusiastic dialogue, they break down the complex science behind these celestial light shows and introduce a newly identified phenomenon known as STEVE.

The Mechanics of the Aurora Borealis

Contrary to more whimsical theories—such as astronauts using flashlights or high-altitude glow worms—the aurora is a result of solar activity. Guy Raz explains that the process begins with a "solar burp," scientifically referred to as a coronal mass ejection. During these intense solar storms, the sun releases a massive bubble of electrified gas containing highly charged particles called electrons into space. These particles travel through the solar system as solar wind.

When these electrons reach Earth, they are drawn toward the planet's magnetic poles (the North Pole and the South Pole). As they enter our atmosphere—the protective blanket of gases surrounding the Earth—they collide with oxygen and nitrogen atoms. These collisions produce the vibrant colors we see in the sky:

  • Oxygen atoms typically create green or red light.
  • Nitrogen atoms result in blue or purple hues.

While the northern lights are known as the aurora borealis, their counterparts in the Southern Hemisphere are called the aurora australis. Furthermore, this phenomenon is not unique to Earth; planets like Jupiter, Saturn, Neptune, and Uranus also exhibit auroras, provided they possess both an atmosphere and a magnetic field.

Unveiling STEVE: The Power of Citizen Science

Beyond the traditional aurora, the hosts discuss a fascinating, distinct light phenomenon researchers have recently identified: STEVE (Strong Thermal Emission Velocity Enhancement). Unlike the standard aurora, STEVE was brought to the attention of the scientific community through the efforts of citizen scientists—everyday people who collect and contribute data to major research projects.

Researchers, including Dr. Elizabeth McDonald from NASA and Dr. Eric Donovan from the University of Calgary, utilized an international database of photographs uploaded by these citizen scientists. By analyzing these images alongside data from European satellites, they discovered that STEVE is associated with a process called subaural ion drift (SED). SEDs occur when magnetic fields rearrange themselves, causing charged particles to scatter and collide with atoms at lower altitudes than those involved in standard auroras.

Conclusion

The episode serves as a reminder of how much there is left to discover about our world and the universe. Through the collaborative efforts of professional scientists and amateur observers, phenomena like STEVE move from being mysterious observations to understood scientific facts. As Mindy and Guy Raz emphasize, the invitation to participate in "citizen science" remains open, encouraging listeners to stay curious and keep exploring the wonders of the world around them.

🎯Key Sentences

1
Check it out.
2
Don't mind if I do.
3
Technically correct is the best kind of correct.
4
How thoughtful.
5
You can say that again.
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📝Key Phrases

1
music to your ears
2
look out of place
3
could use some work
4
any second now
5
hop on board
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📖 Transcript

Grownups, Wondery Plus subscribers can listen to Wow in the World early and ad-free right now.
Join Wondery Plus in the Wondery app or Wondery Kids Plus on Apple Podcasts.
Hey, Wowzer fans, Mindy here.
And before we start the show, I gotta let you know that this November, with a special new episode featuring our friends at Circle Round and Terrestrials on Radiolab for Kids,
And don't miss when Elmo from Sesame Street stops by Wow in the World to make us all belly laugh on November 24th.
Oh, but that's not all, Reg.

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