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NASA's STEREO Detects a CME From the Sun
May 17, 2013
A combined view from two NASA satellites of the coronal mass ejection that occurred on May 17, 2013, at 5:36 EDT. › View larger
A combined view of the coronal mass ejection, or CME, that occurred on May 17, 2013, at 5:36 EDT. The center yellow image was captured by NASA's Solar Dynamics Observatory and shows the sun as seen in UV light, in the 171 Angstrom wavelength. The SDO image is superimposed on top of an image from the Solar and Heliospheric Observatory showing the CME propagating into space. Credit: NASA/SDO/Goddard, ESA&NASA SOHO

On 5:24 a.m. EDT on May 17, 2013, the sun erupted with an Earth-directed coronal mass ejection or CME, a solar phenomenon that can send billions of tons of solar particles into space that can reach Earth one to three days later and affect electronic systems in satellites and on the ground. Experimental NASA research models, based on observations from NASA's Solar Terrestrial Relations Observatory, show that the CME left the sun at speeds of around 745 miles per second. The solar material in CMEs cannot pass through the atmosphere to affect humans on Earth.

Not to be confused with a solar flare, a CME can cause a space weather phenomenon called a geomagnetic storm, which occurs when they connect with the outside of the Earth's magnetic envelope, the magnetosphere, for an extended period of time.

The CME may also pass by Spitzer and its mission operators have been notified. If warranted, operators can put spacecraft into safe mode to protect the instruments from the solar material.

NOAA's Space Weather Prediction Center (http://swpc.noaa.gov) is the U.S. government's official source for space weather forecasts, alerts, watches and warnings.

Updates will be provided if needed.

This video is a combination of two satellite views, showing both the sun and its atmosphere, the corona. The center image shows the sun in UV light, as captured by the Solar Dynamics Observatory, or SDO. The red and larger blue areas show the sun's corona as recorded by two instruments aboard the Solar and Heliospheric Observatory, or SOHO. The CME cloud appears and expands into space from the center left. The white dot on the far left is the planet Mars. Credit: NASA/SDO/Goddard, ESA&NASA SOHO

Related Links

› Frequently Asked Questions Regarding Space Weather
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Page Last Updated: April 1st, 2014
Page Editor: Holly Zell