Sciencecasts - Secret lives of solar flares

[ music ] The Secret Lives of Solar Flares. Brought to you by Science at NASA. 152 years ago, a man in England named Richard Carrington discovered solar flares. It happened at 11:18 AM on the cloudless morning of Thursday, September 1st, 1859. Just as usual on every sunny day, the 33-year-old solar astronomer was busy in his private observatory, projecting an image of the sun onto a screen and sketching what he saw. On that particular morning, he traced the outlines of an enormous group of sunspots. Suddenly, before his eyes, two brilliant beads of white light appeared over the sunspots; they were so bright he could barely stand to look at the screen. Carrington cried out, but by the time a witness arrived minutes later, the first solar flare anyone had ever seen was over. It would not be the last. Since then, astronomers have recorded thousands of strong flares using instruments ranging from the simplest telescopes in backyard observatories to the most complex spectrometers on advanced spacecraft. Possibly no other phenomenon in astronomy has been studied as much. After all that scrutiny, you might suppose that everything about solar flares would be known. Far from it. Last week, researchers announced that solar flares have been keeping a secret-and it's a big one. "We've just learned that some flares are many times stronger than previously thought," says University of Colorado physicist Tom Woods who led the research team. "Solar flares were already the biggest explosions in the solar system and this discovery makes them even bigger." NASA's Solar Dynamics Observatory, launched in February 2010, revealed the secret: About 1 in 7 flares experience a sort of "aftershock." Ninety minutes or so after the flare dies down, it springs to life again, producing an extra surge of extreme ultraviolet radiation. "We call it the 'late phase flare,'" says Woods. "The energy in the late phase can exceed the energy of the primary flare by as much as a factor of four." The extra energy has a big effect on Earth. Extreme ultraviolet wavelengths are particularly good at heating and ionizing Earth's upper atmosphere. When our planet's atmosphere is heated by extreme UV radiation, it puffs up, accelerating the decay of low-orbiting satellites. Furthermore, the ionizing action of extreme UV can bend radio signals and disrupt the normal operation of GPS. SDO was able to make the discovery because of its unique ability to monitor the sun's extreme UV output in high resolution 24 hours a day, 7 days a week. With that kind of scrutiny, it's tough to keep a secret, even one that's 152 years old. To learn more secrets of astronomy, visit science.nasa.gov.