SDO/STEREO Spot Something New On the Sun

Scientists find giant plumes on the sun, newly named "coronal cells" that are over 18,000 miles across, looking like candlesticks on a birthday cake, ...

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First complete image of the solar far side of the sun.

STEREO Far Side Sun Voted Top 2011 NASA Triumph

Public votes STEREO mission as NASA's biggest accomplishment of 2011.

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On left Comet Lovejoy as it approaches the Sun.

Comet Lovejoy -- Many Views

Another view of Comet Lovejoy's solar approach taken by Hinode.

About STEREO

STEREO (Solar TErrestrial RElations Observatory) is the third mission in NASA's Solar Terrestrial Probes program (STP). The mission, launched in October 2006, has provided a unique and revolutionary view of the Sun-Earth System. The two nearly identical observatories - one ahead of Earth in its orbit, the other trailing behind - have traced the flow of energy and matter from the Sun to Earth. STEREO has revealed the 3D structure of coronal mass ejections; violent eruptions of matter from the sun that can disrupt satellites and power grids, and help us understand why they happen. STEREO is a key addition to the fleet of space weather detection satellites by providing more accurate alerts for the arrival time of Earth-directed solar ejections with its unique side-viewing perspective.

› How STEREO Views the Entire Sun

News

A 360 Degree View of an X-class Flare and A CME

The sun sent out two different kinds of solar activity on November 3, 2011 in different directions: an X.19 solar flare and a particularly bright CME.
STEREO Celebrates Five Years

On Oct. 25, 2006 STEREO launched to do something never done before: see the entire sun simultaneously.
Space Storm Tracked from Sun to Earth

For the first time, a spacecraft far from Earth has turned and watched a solar storm engulf our planet.
STEREO Sees Complete Far Side

The is the first complete image of the solar far side, the half of the sun invisible from Earth.
Having a Solar Blast - UPDATE

Earth is still waiting for the arrival of the CME unleashed June 7, 2011 but the forecasts of the glancing blow have been substantially reduced. The Sun unleashed an M-2 solar flare, an S-1 radiation storm and a spectacular coronal mass ejection in the early hours of June 7, 2011.