With a techniques borrowed from earthquake detection, researchers are learning to predict where sunspots will boil-up. That gives officials in charge of satellites, power grids and radio communications more warning of crippling geomagnetic storms.
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00:00Scientists are learning to predict sunspots before they can actually be seen.
00:07That's important because these dark stains on the sun's surface can herald scary solar flares
00:14and huge coronal mass ejections, which sometimes fry sensitive satellites in Earth orbit
00:19and cause power outages on the ground.
00:23Such storms are born deep inside the sun, results of titanic magnetic forces at work there.
00:30These turbulent bubbles boil up to the surface of our star,
00:34where astronomers have been watching them for more than 400 years.
00:39But just recently, astrophysicists using techniques similar to those used for earthquake monitoring
00:45have deduced that subtle vibrations rippling across the visible facade of the sun
00:49are correlated to disturbances far below.
00:52It's a technique they call helioseismology.
00:56In basic terms, sound waves travel faster across a submerged sunspot-forming region
01:01than they do through the surrounding area.
01:04The acoustic energy signature may appear more than 15 seconds earlier
01:08if it's been ringing across a particularly big storm.
01:12That can give officials in charge of communications networks or power grids
01:16as much as two days' notice before a sunspot finally percolates up.
01:21That's plenty of time to know if the sunspot will be aimed at Earth.
01:26The trick now is to figure out which sunspots will produce flares and mass ejections
01:31and exactly when they'll fire.
01:34But scientists don't know how to do that trick just yet.