4th grade
aurora borealis
At the center of our solar system lies the sun, the yellow star that sustains life on our planet. The sun's many magnetic fields distort and twist as our parent star rotates on its axis. When these fields become knotted together, they burst and create so-called sunspots. Usually, these sunspots occur in pairs; the largest can be several times the size of Earth's diameter.
At the center of the sun, the temperature is 27 million degrees Fahrenheit (15 million degrees Celsius). As the temperature on its surface rises and falls, the sun boils and bubbles. Particles escape from the star from the sunspot regions on the surface, hurtling particles of plasma, known as solar wind, into space. It takes these winds around 40 hours to reach Earth. When they do, they can cause the dramatic displays known as the aurora borealis.
At the center of the sun, the temperature is 27 million degrees Fahrenheit (15 million degrees Celsius). As the temperature on its surface rises and falls, the sun boils and bubbles. Particles escape from the star from the sunspot regions on the surface, hurtling particles of plasma, known as solar wind, into space. It takes these winds around 40 hours to reach Earth. When they do, they can cause the dramatic displays known as the aurora borealis.
Auroras form when charged particles from the sun collide with Earth’s atmosphere. When there is an influx of charged particles during geomagnetic storms, this can supercharge the aurora’s glow, according to Terry Onsager, a physicist at the Space Weather Prediction Center.
“It’s like a big battery driving electricity through the Earth’s system,” he said. “And when that flows through the atmosphere, the atmosphere glows like a neon light.” The particles are the result of a coronal mass ejection, an outpouring of plasma from the sun’s atmosphere. |