This version of SDO: Three Years in Three Minutes is extended and narrated by NASA's Goddard Space Flight Center heliophysicist Alex Young. He highlights many interesting aspects of the video and points out several of the single-frame events that appear in it.
In the three years since it first provided images of the sun in the spring of 2010, NASA's Solar Dynamics Observatory (SDO) has had virtually unbroken coverage of the Sun's rise toward solar maximum, the peak of solar activity in its regular 11-year cycle. This video shows those three years of the Sun at a pace of two images per day. Each image is displayed for two frames at a 29.97 frame rate.
SDO's Atmospheric Imaging Assembly (AIA) captures a shot of the Sun every 12 seconds in 10 different wavelengths. The images shown here are based on a wavelength of 171 Angstroms, which is in the extreme ultraviolet range and shows solar material at around 600,000 Kelvin. In this wavelength it is easy to see the Sun's 25-day rotation as well as how solar activity has increased over three years.
During the course of the video, the Sun subtly increases and decreases in apparent size. This is because the distance between the SDO spacecraft and the Sun varies over time. The image is, however, remarkably consistent and stable despite the fact that SDO orbits the Earth at 6,876 miles per hour and the Earth orbits the Sun at 67,062 miles per hour.
Such stability is crucial for scientists, who use SDO to learn more about our closest star. These images have regularly caught solar flares and coronal mass ejections in the act, types of space weather that can send radiation and solar material toward Earth and interfere with satellites in space. SDO's glimpses into the violent dance on the Sun help scientists understand what causes these giant explosions — with the hopes of some day improving our ability to predict this space weather.
The four wavelength view at the end of the video shows light at 4500 Angstroms, which is basically the visible light view of the Sun, and reveals sunspots; light at 193 Angstroms which highlights material at 1 million Kelvin and reveals more of the Sun's corona; light at 304 Angstroms which highlights material at around 50,000 Kelvin and shows features in the transition region and chromosphere of the Sun; and light at 171 Angstroms.
Noteworthy events that appear briefly in the main sequence of this video:
00:30;24 Partial eclipse by the moon
00:31;16 Roll maneuver
01:11;02 August 9, 2011 X6.9 Flare, currently the largest of this solar cycle
01:28;07 Comet Lovejoy, December 15, 2011
01:42;29 Roll Maneuver
01:51;07 Transit of Venus, June 5, 2012
02:28;13 Partial eclipse by the moon
Credit: NASA SDO