By combining images taken almost simultaneously from the Ahead and Behind STEREO spacecraft, researchers have generated a 3-D sequence of four images that track an active solar region over about a one-week period (April 29 through May 5). The images were all taken in the 171 Angstrom wavelength of extreme ultraviolet light. Active regions, which are areas of intense magnetic activity, appear brighter in UV light. The region is seen moving from left to right as the Sun's rotation carries it along. Arcing loops above the active region reveal million-degree Celsius particles spinning along magnetic field lines.
This is a composite of several images taken by the Extreme ultraviolet Imaging Telescope (EIT) on board SOHO, taken at a wavelength of 30.4 nanometres, shown in orange. It shows plasma at a temperature of about 60 000 – 80 000 Kelvin. The images were taken over an entire solar cycle and illustrate the changes in solar activity.
This is a composite of several images taken by the Extreme ultraviolet Imaging Telescope (EIT) on board SOHO, taken at a wavelength of 17.1 nanometres, shown in blue. It shows plasma at a temperature of about 1 million Kelvin. The images were shot over an entire solar cycle and illustrate the changes in solar activity.
This is a composite of several images taken by the Extreme ultraviolet Imaging Telescope (EIT) on board SOHO, taken at a wavelength of 19.5 nanometres, shown in green. It shows plasma at a temperature of about 1.5 million Kelvin. The images were taken over an entire solar cycle and illustrate the changes in solar activity.
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