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National Aeronautics and Space Administration

Goddard Space Flight Center

Sun-Earth Day 2009: Our Sun Yours to Discover.

Sun-Earth Day 2009: Our Sun Yours to Discover

IMAGE GALLERY

Stunning Looping Arcs, June 9-10, 2007
Stunning Looping Arcs, June 9-10, 2007

This STEREO image and video clip of the Sun in extreme ultraviolet light (June 9-10, 2007) showcases a string of active regions near the Sun's equator over about 36 hours. We see several active regions (brighter areas with the loops above them) that were lined up as they approached the edge of the Sun. With frames being taken every two and a half minutes, scientists can observe the activity along these magnetic field lines in exquisite detail. Active regions are areas of intense magnetic activity that appear brighter in extreme UV light, in this case the wavelength of 171 Angstroms. The images were captured by the Behind spacecraft.

NASA Fact

On April 8, 1947, the largest sunspot in modern history reached its maximum size of over 330 times Earth's area.