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SOLAR SCIENCE
Activity Continues On the Sun
by Karen C. Fox for Goddard Space Flight Center
Greenbelt, MD (SPX) May 20, 2013


These images from NASA's Solar Dynamics Observatory show four X-class flares emitted on May 12-14, 2013 - the first four X-class flares of 2013. Each panel is a blend of two images one showing light in the 171 Angstrom wavelength and the other in 131 Angstroms. Credit: NASA/SDO/GSFC. For a larger version of this image please go here.

Solar activity continued on May 14, 2013, as the sun emitted a fourth X-class flare from its upper left limb, peaking at 9:48 p.m. EDT. This flare is classified as an X1.2 flare and it is the 18th X-class flare of the current solar cycle.

The flare caused a radio blackout - categorized as an R3, or strong, on NOAA's space weather scales from R1 to R5 - which has since subsided.

The flare was also associated with a non-Earth-directed CME. CMEs and flares are separate but related solar phenomena: solar flares are powerful bursts that send light and radiation into space; CMEs erupt with billions of tons of solar material.

They often, but do not always, occur together. Any time we can see a solar flare from Earth's view, than at least some of its light and radiation must be directed at Earth. CMEs on the other hand may or may not be Earth directed. NASA observes CMEs, however, even when they are not traveling toward Earth, because they may impact spacecraft.

Experimental NASA research models show that this CME left the sun at around 745 miles per second, beginning at 10:18 p.m. EDT.

It is not Earth-directed, however it may pass the Spitzer and Epoxi orbits, and their mission operators have been notified. If warranted, operators can put spacecraft into safe mode to protect the instruments from solar material.

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Related Links
Sun-Earth at NASA
Solar Science News at SpaceDaily






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