The sun erupted with a coronal mass ejection or CME earlier today. The eruption began at 7:09 a.m. EST (12:09 UTC). When a CME erupts from the sun, it sends solar particles into space, which may – if the CME is headed our way – reach Earth several days later. There is no danger to us on Earth’s surface from an Earth-directed CME, but these events can affect electronic systems in satellites and on Earth.
NASA’s Solar Terrestrial Relations Observatory (STEREO) captured the image of today’s CME at 8:54 a.m. EST (13:54 UTC), about two hours after it left the sun.
NASA says the CME left the sun at speeds of 450 miles per second, which, it says, is a slow-to-average speed for this type of solar phenomenon. When a CME erupts from the sun, a geomagnetic storm occurs, producing beautiful auroras, or northern lights, for those at northerly latitudes.
NASA says that, in the past, CMEs with the slow-to-average speed of the November 20 event haven’t typically caused substantial geomagnetic storms. NASA explained:
They have caused auroras near the poles but are unlikely to cause disruptions to electrical systems on Earth or interfere with GPS or satellite-based communications systems.
Bottom line: The sun produced a coronal mass ejection, or CME, today (November 20, 2012). See a photo of the CME leaving the sun in this post.
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.