Browse Archive

  • SDO image of coronal mass ejection on 06.07.2011 taken in 304 Angstrom.

    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.

  • March 7, 2010 STEREO HI-1A imge with two stars highlighted (left). Chart of varying brightness of these two stars (right).

    STEREO Spacecraft Discovers New Eclipsing Binary Stars

    Although STEREO is primarily a solar mission, UK scientists were able to use the Heliospheric Imagers aboard STEREO to monitor variations in the brightness of stars.

  • Latest image of the far side of the Sun based on high resolution STEREO data, taken on February 2, 2011 at 23:56 UT.

    First Ever STEREO Images of the Entire Sun

    Four years after launch NASA's two STEREO spacecraft are now 180 degrees apart and able to image the entire Sun.

  • On February 6, the two STEREO spacecrafts will be 180 degrees apart and for the next 8 years the STEREO spacecrafts and SDO will be able to observe the entire 360 degrees of the Sun.

    NASA Releasing First Views Of The Entire Sun On Super Sun-Day

    NASA will score big on super SUN-day at 11 a.m. EST, Sunday, Feb. 6, with the release online of the first complete view of the sun's entire surface and atmosphere.

  • A coronal mass ejection (CME) observed by STEREO on Dec. 12, 2008.

    Solar Storms can Change Directions  →

    Solar storms don't always travel in a straight line. But once they start heading in our direction, they can accelerate rapidly, gathering steam for a harder hit on Earth's magnetic field.

  • Northern portion of Solar disruption on April 1.

    Spacecraft Observes Coronal Mass Ejection

    One of the fastest CMEs in years was captured by the STEREO COR1 telescopes on August 1, 2010.

  • The STEREO (Ahead) spacecraft caught this spectacular eruptive prominence in extreme UV light as it blasted away from the Sun (Apr. 12-13, 2010).

    STEREO Captures Huge Eruptive Prominence

    The STEREO spacecraft caught this spectacular eruptive prominence in extreme UV light over a 19-hour period between Apr. 12-13, 2010.

  • screen shot of 3D Sun iPhone application

    3D Sun for the iPhone

    Imagine holding the entire sun in the palm of your hand. Now you can with the help of a new iPhone app developed by NASA-supported programmers.

  • Still from movie showing head-on and profile views of a solar coronal wave

    Mystery of the Solar Tsunami—Solved

    Sometimes you really can believe your eyes. That's what NASA's STEREO is telling researchers about a controversial phenomenon on the sun known as the "solar tsunami."

  • STEREO image of an eruption from the Sun

    STEREO Captures Sun's Eruption

    The twin STEREO spacecraft captured this large and dramatic prominence eruption over about a 30-hour period between Sept. 26-27, 2009.

  • STEREO spacecraft image of a coronal mass ejection (CME)

    STEREO Spies First Major Activity of Solar Cycle 24

    NASA′s Solar Terrestrial Relations Observatory (STEREO) spacecraft has spotted the first major activity of the new solar cycle.

  • Image of the sun with solar storms

    STEREO Reveals the Anatomy of Solar Storms

    STEREO spacecraft images and in situ measurements combine to show a complete picture of CMEs that paves the way for predicting solar storms like meteorologists predict hurricanes.

  • Beauty shot of STEREO

    Join STEREO and Explore Gravitational "Parking Lots" That May Hold Secret of Moon's Origin

    Two places on opposite sides of Earth may hold the secret to how the moon was born.

  • STEREO orbit

    STEREO in Quadrature

    January 24, 2009 marks the point at which the two STEREO spacecraft reach 90 degrees separation, a condition known as quadrature. Since the two STEREO spacecraft went into orbit around the Sun at the beginning of 2007, they have been slowly drifting apart from Earth, and from each other. After two years in solar orbit, the two spacecraft have finally reached quadrature.

  • hi1-B image of the comet p2003k2

    SECCHI Makes a Fantastic Recovery!

    You would think that, after 13-years of historic comet discoveries with SOHO and two years of amazing STEREO/SECCHI observations and discoveries, we had put a check-mark in most of the boxes for comet-related achievements. But last week, Australian comet-hunter Alan Watson helped us with yet another historic achievement -- the recovery of a comet! Here's how it unfolded.

  • image of solar flare

    Solar Flare Surprise

    Solar flares are the most powerful explosions in the solar system. Packing a punch equal to a hundred million hydrogen bombs, they obliterate everything in their immediate vicinity. Not a single atom should remain intact. At least that's how it's supposed to work.

  • solarjet_100x75

    Twisting Solar Jets in STEREO

    Coronal jets are small-scale transient ejections of hot gases, or plasma, occurring in the solar atmosphere. During a typical event, about a million tons of matter are ejected at speeds reaching a million miles per hour over a few minutes' time.

  • 195tsunami_100x75

    Solar Tsunami - May 19, 2007

    Sequences of STEREO satellite images of a solar tsunami blasting across the Sun's million degree atmosphere.

  • Artist concept of Van Allen Radiation Belts around Earth

    Killer Electrons Surf Celestial Tsunamis

    Boosted to almost the speed of light, "killer electrons" can knock out computers, pierce spacesuits and damage the tissues of astronauts.

  • Thumbnail of Comet Encke

    Solar Hurricane Tears Comet Tail Off

    NASA's STEREO satellite captured the first images ever of a collision between a coronal mass ejection and a comet.