STEREO | What's New

STEREO's anticipated observations of Comet ISON

February 14, 2013

Astronomers are eagerly awaiting the arrival of Comet ISON, which will pass within just 2.7 solar radii from Sun center on November 28, 2013 (U.S. Thanksgiving). Although comets are unpredictable, Comet ISON has the potential to be a major comet. If so, STEREO should have a spectacular view. To assist with planning for this event, a new web page has been put together describing Comet ISON's orbit, and how the comet will be seen by STEREO's telescopes, and those on other solar observatories.

Earth now visible in STEREO Behind's Inner Heliospheric Imager

December 21, 2012

The STEREO Behind spacecraft has now moved far enough in its orbit for Earth to enter the HI1-B field-of-view. Earth has been visible in the HI2 telescopes since launch, but this is the first time it's been visible in either of the HI1 telescopes, which image areas closer to the Sun. This is happening because the STEREO spacecraft are moving closer to the points in their orbits at which they will be directly opposite Earth on the other side of the Sun.

NASA STEREO Observes One of the Fastest CMEs On Record

August 15, 2012

On July 23, 2012, a massive cloud of solar material erupted off the sun's right side, zooming out into space, passing one of NASA's STEREO spacecraft along the way. Using the STEREO data, scientists at NASA's Goddard Space Flight Center in Greenbelt, Md. clocked this giant cloud, known as a coronal mass ejection, or CME, as traveling between 1,800 and 2,200 miles per second as it left the sun.

Giant sunspot shoots out intense, X-class solar flare

July 12, 2012

A massive sunspot region facing Earth - known as 1520 - has unleashed a large solar flare. NOAA�s Space Weather Prediction Center says the flare is rated an X1.4. This type of flare is considered �strong� and can cause a blackout of high frequency radio communication on the sunlit side of Earth for one to two hours.

STEREO B sees NOVA SAGITTARII 2012

April 9, 2012

NOVA SAGITTARII 2012 = PNV J17452791-2305213, becomes apparent in STEREO HI1B imager across 20120420-23.

SDO and STEREO Spot Something New On the Sun

April 9, 2012

One day in the fall of 2011, Neil Sheeley, a solar scientist at the Naval Research Laboratory in Washington, D.C., did what he always does � look through the daily images of the sun from NASA's Solar Dynamics Observatory (SDO).

But on this day he saw something he'd never noticed before: a pattern of cells with bright centers and dark boundaries occurring in the sun's atmosphere, the corona. These cells looked somewhat like a cell pattern that occurs on the sun's surface -- similar to the bubbles that rise to the top of boiling water -- but it was a surprise to find this pattern higher up in the corona, which is normally dominated by bright loops and dark coronal holes.

What is the biggest NASA accomplishment of 2011?

March 12, 2012

Twin Solar Spacecraft Take First Complete Image of Far Side of Sun

Triangular shaped object in STEREO data explained

January 4, 2012

Some people have noticed a strange triangular or diamond-shape "object" entering the field-of-view of the HI2 telescope on STEREO Behind around December 26, 2011. You can see the feature in question in this movie moving from right-to-left, just above the trapezoidal occulter on the right side of the image, and more clearly in this close-up movie. What is this?

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

November 4, 2011

The two STEREO spacecraft now sit on opposite sides of the sun providing a view of the latest solar activity for the entire solar system.

STEREO Mission Celebrates Five Incredible Years of Science

October 25, 2011

On October 25, 2006 a Delta II rocket launched from Cape Canaveral carrying two nearly identical spacecraft. Each satellite was one half of a mission entitled Solar TErrestrial RElations Observatory (STEREO) and they were destined to do something never done before - see the entire sun simultaneously.

Space Storm Tracked from Sun to Earth

August 18, 2011

For the first time, a spacecraft far from Earth has turned and watched a solar storm engulf our planet. The movie, released today during a NASA press conference, has galvanized solar physicists, who say it could lead to important advances in space weather forecasting.

Scientists see solar outburst in exquisite detail

April 21, 2011

Combined data from the STEREO and ACE spacecraft are being used to study the structure of a CME in unprecedented detail, showing considerable evolution in the CME's internal structure as it moves from the Sun to Earth.

STEREO turns its steady gaze on variable stars

April 19, 2011

Researchers have discovered 122 new eclipsing binary stars and observed hundreds more variable stars in an innovative survey using NASA's two STEREO solar satellites.

STEREO sees the Entire Sun

February 6, 2011

On February 6, 2011, NASA released the first ever images of the entire Sun, using a combination of STEREO images together with data from the Solar Dynamics Observatory. This never before seen view was made possible by STEREO's unique viewing geometry.

Coming Soon - The Entire Sun

February 2, 2011

For the past 4 years, the two STEREO spacecraft have been moving away from the Earth and gaining a more complete picture of the sun. On February 6, 2011, NASA will reveal the first ever images of the entire sun and discuss the importance of seeing all of our dynamic star.

PUBLIC SPOT SIGNIFICANT SOLAR STORM HEADING FOR EARTH THIS WEEK IN FIRST FOR ONLINE SOLAR STORMWATCH PROJECT

December 10, 2010

For the first time scientists have used data analysed by the public to make a real-time prediction of a solar storm that should reach Earth on Monday 13 December, thanks to the Solar Stormwatch web project.

The initiative, launched in February by the Royal Observatory, Greenwich (ROG), in partnership with the STFC Rutherford Appleton Laboratory and the Zooniverse citizen science project, makes it possible for anyone with an internet connection to get involved in the latest solar research by helping to spot and track storms as they erupt from the surface of the Sun. These collective measurements enable scientists to forecast the arrival of storms far enough in advance to issue effective pre-emptive warnings for the first time.

The Sun is much more dynamic than it appears to the naked eye. Intense magnetic fields churn and pummel the Sun�s atmosphere and they store enormous amounts of energy that, when released, can hurl billions of tons of material out into space in eruptions called Coronal Mass Ejections (CMEs) � or solar storms.

The latest storm identified by the project is predicted to hit Earth at 07.32 GMT on 13 December. Solar storms have the potential to interfere with communication satellites, upset GPS navigation systems and also pose a health risk to astronauts on the International Space Station. In severe cases they can even knock out entire power grids causing widespread disruption here on Earth. On a gentler note, the particles making up a solar storm can produce beautiful displays of the Northern and Southern Lights as they collide with the Earth's upper atmosphere. Scientists are not overly concerned about the effects of the current storm, but the early warning provided by Solar Stormwatch will allow precautionary measures to be put in place.

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STEREO Sees the Farside of the Sun, Feb. 2011

October 1, 2010

Illustration of the positions of the two STEREO spacecraft show that they attain 180 degrees of separation in Feb. 2011, thus allowing the world to see the entire Sun for the first time.

STEREO sees Mercury's tail

September 24, 2010

Scientists from Boston University's Center for Space Physics (CSP) reported the presence of a comet-like tail in images of the planet Mercury taken by STEREO, in a presentation given September 22, 2010 at the European Planetary Science Congress (EPSC) meeting in Rome.

Zig-Zagging Solar Storms

September 22, 2010

Solar researchers have used a novel set of techniques using STEREO data that allow them to watch the acceleration and deflection of coronal mass ejections with unprecedented precision.

Coronal Mass Ejection Headed for Earth

August 2, 2010

On August 1st around 0855 UT, Earth orbiting satellites detected a C3-class solar flare. The origin of the blast was Earth-facing sunspot 1092. C-class solar flares are small (when compared to X and M-class flares) and usually have few noticeable consequences here on Earth besides aurorae. This one has spawned a coronal mass ejection heading in Earth's direction.

A 3D Solar Wave

June 14, 2010

When a coronal mass ejection (CME) erupts from the Sun, movies in extreme ultraviolet light often show enormous waves, spreading over a large area on the solar surface, just as tsunamis travel far from the original seismic event. Now STEREO data have been used to show that these waves are the footprints of giant domes that spread upward into the corona as well as outward across the surface.

STEREO spacecraft catch comet diving into Sun

April 23, 2010

Using instruments aboard NASA's twin STEREO spacecraft, four post-doctoral fellows at UC Berkeley's Space Sciences Laboratory were able to track the comet as it approached the Sun (Mar. 11-12, 2010) and estimate an approximate time and place of impact.

Sun Erupts: Epic Blast Seen by NASA Solar Observatory

April 23, 2010

NASA's new Solar Dynamics Observatory may be getting all the press this week for its retina-searing first pictures of the sun. But two old sun-observing warhorses recently showed they're not quite ready for pasture yet.

Solar Story: Understanding the Sun

March 8, 2010

STEREO featured live and on-line in a new exhibition at the UK National Maritime Museum

Solar Storm Watch

March 8, 2010

Solar scientists need you! Help them spot explosions on the Sun and track them across space to Earth. Your work will give astronauts an early warning if dangerous solar radiation is headed their way. And you could make a new scientific discovery.

STEREO iPhone App

January 19, 2010

A new free application for iPhones lets you access up-to-date global views of the Sun from STEREO along with solar activity alerts and other features. With this application, you can interactively view the Sun from any angle, and zoom in on features of interest, based on combined images from both STEREO spacecraft.

Wondering what those odd sphere-like features are in recent STEREO EUVI images?

January 27, 2010

We have investigated, and determined that these are artifacts caused by an interaction between the high compression factors used for the beacon data, and cosmic ray events on the detector. Our discussion of image artifacts has been updated to include this phenomenon. Another factor which has contributed to this issue has been the recent delay in receiving the full resolution images from the spacecraft. This was caused by a server problem at the Deep Space Network, and has now been resolved.

Do Solar Tsunami's Exist?

November 20, 2009

The twin STEREO spacecraft confirmed their reality in February 2009 when sunspot 11012 unexpectedly erupted. The blast hurled a billion-ton cloud of gas (a coronal mass ejection, or CME) into space and sent a tsunami racing along the sun's surface. STEREO recorded the wave from two positions separated by 90 degrees, giving researchers an unprecedented view of the event.

STEREO Captures Sun's Eruption

October 6, 2009

The twin STEREO spacecraft (called "Behind" and "Ahead" denoting their relative positions in space), now almost 120 degrees apart, captured this large and dramatic prominence eruption over about a 30-hour period between Sept. 26-27, 2009. Prominences, called filaments when they are viewed against the surface of the Sun, are clouds of cooler gas suspended above the Sun�s surface by magnetic forces. This erupting prominence was large enough that both spacecraft were able to observe it for hours on end, one of the first times that has occurred.

May 15,2009 -- Mysterious comets and igniting planets? No, they're mostly just ghosts...

May 15, 2009

Regular viewers of SOHO and STEREO data are well familiar with the variety of strange artifacts we see in the satellites images sometimes. We see various strange blobs, reflections and streaks, and I frequently get emails about them (which is something I strongly encourage: you learn by asking questions, so ask away!). Of course, all of these things we see in the data are completely explainable when armed with the appropriate knowledge of CCD detectors (like in digital cameras) and instrument optics (telescopes, lenses, etc). So after over 13 years of SOHO/LASCO images, we have seen and explained every weird artefact that has appeared in the data, and occasionally responded to a few popular myths. More recently (October 2006), we launched the STEREO/SECCHI mission and began send back data from that too. As expected, the STEREO/SECCHI 'COR2' telescopes see exactly the same blobs and streaks (dust, cosmic rays, etc) that we see in LASCO. So no explanation needed there. But the Heliospheric Imagers (HI) are a new kind of telescope and with that comes a new set of strange image effects. So what I'm going to do here is address the two most commonly questioned artifacts that we see in the HI images and explain what they are and why we see them.

Gravity wells could provide parking lots for spaceships

July 14, 2009

Nature has provided five huge rest stops far out in space for the convenience of spacecraft traveling from Earth. Some NASA folks call them "parking lots" in space. They're unusual locations where gravity loses its pull and a spaceship can loiter, rather like a marble at the bottom of a cup, without using a lot of fuel. Three of them are 930,000 miles outside Earth's orbit. One is between the Earth and the sun, and another is hidden on the far side of the sun.

STEREO Spies First Major Activity of Solar Cycle 24

May 15,2009

NASA.s Solar Terrestrial Relations Observatory (STEREO) spacecraft has spotted the first major activity of the new solar cycle. On May 5 STEREO-B observed a Type II radio burst and a bright, fast coronal mass ejection (CME) emanating from the far side of the sun. The activity originated in a solar active region that rotated into view from Earth on May 8.

NASA'S STEREO spacecraft reveals anatomy of a solar storm in 3-D.

April 14, 2009

Observations in 3-D from NASA's twin Solar Terrestrial Relations Observatory (STEREO) spacecraft have allowed scientists, for the first time, to reveal the true size and shape of solar explosions known as coronal mass ejections, or CMEs.

STEREO-20: Coming soon to a night sky near you!

April 9, 2009

STEREO's 20th comet has been discovered... and it's a pretty exciting one! Comet C/2009 G1 (STEREO), also known as STEREO-20, was announced earlier today on MPEC 2009-G30. Discovered yesterday by Chinese amateur astronomer Jiangao Ruan, it is a small but relatively bright (~mag 10-11) comet that, unlike most of SOHO and STEREO's comet discoveries, does not belong to any known population or group of objects. This in itself makes it an interesting target, but the most exciting part of this discovery is that it is very likely to be visible from Earth to observers with relatively small telescopes! This may not seem like a particularly big deal, but of the more than 1,600 comets discovered by SOHO, only a very small number have ever been seen from the ground (perhaps most notably C/1998 J1 (SOHO)), and none of STEREO's other nineteen discoveries have been ground-observable at all.

STEREO Hunts for Remains of an Ancient Planet near Earth

April 9, 2009

NASA's twin STEREO probes are entering a mysterious region of space to look for remains of an ancient planet which once orbited the Sun not far from Earth. If they find anything, it could solve a major puzzle--the origin of the Moon. "The name of the planet is Theia," says Mike Kaiser, STEREO project scientist at the Goddard Space Flight Center. "It's a hypothetical world. We've never actually seen it, but some researchers believe it existed 4.5 billion years ago - and that it collided with Earth to form the Moon."

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

April 9, 2009

Two places on opposite sides of Earth may hold the secret to how the moon was born. NASA's twin Solar Terrestrial Relations Observatory (STEREO) spacecraft are about to enter these zones, known as the L4 and L5 Lagrangian points, each centered about 93 million miles away along Earth's orbit.

Black Rain

March 31, 2009

Two artists, Ruth Jarman and Joe Gerhardt of Semiconductor Films, have taken STEREO imagery and combined it with sound into a short film which impressed us, and we think you will enjoy. In their own words, "Here we see the HI (Heliospheric Imager) visual data as it tracks interplanetary space for solar wind and CME's (coronal mass ejections) heading towards Earth. Working with STEREO scientists, Semiconductor collected all the HI image data to date, revealing the journey of the satellites from their initial orientation, to their current tracing of the Earth?s orbit around the Sun. Solar wind, CME's, passing planets and comets orbiting the sun can be seen as background stars and the milky way pass by."

100 Hours of Astronomy. Around the world in 80 telescopes.

March 23, 2009

Do gravity holes harbour planetary assassins?

February 19, 2009

THEY are the places gravity forgot. Vast regions of space, millions of kilometres across, in which celestial forces conspire to cancel out gravity and so trap anything that falls into them. They sit in the Earth's orbit, one marching ahead of our planet, the other trailing along behind. Astronomers call them Lagrangian points, or L4 and L5 for short. The best way to think of them, though, is as celestial flypaper.

NASA Sees the 'Dark Side' of the Sun

January 23, 2009

Today, NASA researchers announced an event that will transform our view of the Sun and, in the process, super-charge the field of solar physics for many years to come.

STEREO IN QUADRATURE

January 22, 2009

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. Ahead has been drifting at an average rate of 22 degrees per year in front of Earth, and Behind has been drifting at the same rate in the opposite direction. After two years in solar orbit, the two spacecraft have finally reached quadrature.

SECCHI Makes a Fantastic Recovery!

December 17, 2008

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.

Solar Flare Surprise

December 15, 2008

Dec. 15, 2008: 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. "We've detected a stream of perfectly intact hydrogen atoms shooting out of an X-class solar flare," says Richard Mewaldt of Caltech. "What a surprise! These atoms could be telling us something new about what happens inside flares."

No separation anxiety for STEREO

August 19, 2008

The two STEREO spacecraft (Ahead and Behind) continue to separate, by orbit design, so that they are 66 degrees apart from each other as of August 5, 2008. This allows them to see more and more of the Sun at the same time. The Behind spacecraft can see 31 degrees more of the Sun than can be seen from Earth.

Twisting Solar Jets in STEREO

June 4, 2008

STEREO has made possibly the first 3D measurements of a solar jet. Jets are columns of super hot plasma (hot ionized gases at over a million degrees) which shoot out from the sun over the course of just a few minutes - this one reached velocities of 300 km/s (650,000 miles/hour). It was over 10,000 kilometers high and nearly half as wide as the Earth.

STEREO observed it from two points of view 11 degrees apart. With these images it could be clearly seen that the jet was twisted. This twist is important. It agrees with models of jets in which they are caused by the twisting of magnetic field lines. Highly twisted magnetic fields eventually become unstable, much like an over-wound spring. When the writhing fields come into contact with nearby untwisted fields that extend into the solar wind, the twist is transferred to those very long field lines. The twist then rapidly leaves the Sun, pushing the plasma outward at high speed.

Solar Tsunami - May 19, 2007

April 7, 2008

The figure shows a sequence of three 195 A difference images obtained by the EUVI instrument on STEREO taken on May 19, 2007. The images show a tsunami blasting through the Sun's atmosphere at millions of kilometers per hour.

STEREO: The Sun's Corona Unraveled in 3D

March 18, 2008

At the largest scale, the Sun's corona (outermost atmosphere) consists of so-called streamers: huge, pointy cones of enhanced density. On a more basic level, everything in the corona is made up of overlapping loops, sometimes with their tops blown indefinitely upward.

The Science Gallery launched at TCD with LIGHTWAVE exhibition

February 06, 2008

Featuring amongs the installations, is the Heliosphere an installation by TCD astrophysics lecturer Dr Peter Gallagher and Anna Hill, which allows you see 3D close-up satellite footage of the surface of the sun taken by NASA and European Space Agency spacecraft. There is is also an opportunity to try out some interactive clothing that will allow you to "feel" solar flares.
View the movie on youtube about this exhibit. STEREO is not mentioned until the end.

Celestial tsunamis

January 30, 2008

U physicists discover powerful radio waves that may lead to spacecraft damage. The culprit? The most powerful radio waves of their kind ever detected in the Belts. The researchers not only discovered the waves but showed that they are capable of accelerating electrons to near the speed of light--which gives the electrons enough energy to knock out computers, pierce spacesuits, and damage the tissues of astronauts--and that they can do it astonishingly fast.

What's the Angle?

January 17, 2008

The two STEREO spacecraft have been slowly separating over most of the mission, so that now they are 44 degrees apart as of Jan. 8, 2008. They will continue to separate as the mission proceeds. So, what does this gain us? Well, for a time we could generate real 3D images and movies of the Sun for the first time. But there is another major advantage to the widening angle.

Twin Probes Watch Sun's Fury in 3-D

January 16, 2008

Astronomers got a new perspective on the sun in April, when NASA's Solar Terrestrial Relations Observatory (STEREO) probes began sending back the first three-dimensional images of our nearest star. NASA built the twin spacecraft to learn more about coronal mass ejections, or CMEs�billion-ton spitballs of electrically charged particles that sporadically fire off from the sun. When CMEs slam into Earth, their electric fields can blow out the circuits of communications satellites or overload regional power grids. "Anything that's electromagnetic can be affected by their charged particles," says NASA astrophysicist Madhulika Guhathakurta, a program scientist for STEREO.

Stellar variability studies with STEREO's Heliospheric Imager

January 2, 2008

STEREO's Heliospheric Imagers are ideally placed for observing stellar variability. The nature of the synoptic observations means that stars can be tracked continuously through the 2 cameras on both spacecraft for up to 180 days. In some cases, it has taken ground based astronomers years to accumulate enough data to study a star's variability.

Imaging the Solar Winds as it Sweeps Past Earth

December 24, 2007

Data from STEREO's SECCHI Heliospheric Imagers have been used to image gusts in the solar wind as they go by the Earth

Planet identification in STEREO coronagraph images

December 22, 2007

We've been getting a lot of questions lately asking what this small round object was that passed through the COR2-Ahead field of view from December 22nd to January 2nd. Hence, we decided to post this to answer everybody's questions. It's the planet Mercury.

Video Q&A

October 31, 2007

Questions with Answers from STEREO Team Members

Naked Science - "Solar Force"

October 24, 2007

This TV show, which prominently features STEREO will be premiering on the National Geographic Channel Oct. 30 at 9:00 ET: http://channel.nationalgeographic.com/channel/ET/daily/20071030.html
It will replay a number of times after that.

NASA Satellite Sees Solar Hurricane Tear Comet Tail Off

October 1, 2007

NASA's STEREO satellite captured the first images ever of a collision between a solar "hurricane", called a coronal mass ejection (CME), and a comet. The collision caused the complete detachment of the comet's plasma tail. Comets are icy leftovers from the solar system's formation billions of years ago. They usually hang out in the cold, distant regions of the solar system, but occasionally a gravitational tug from a planet, another comet, or even a nearby star sends them into the inner solar system. Once there, the sun's heat and radiation vaporizes gas and dust from the comet, forming its tail. Comets typically have two tails, one made of dust and a fainter one made of electrically conducting gas, called plasma.

Path of Totality: The Movie

September 21, 2007

On March 29, 2006, a NASA-led science expedition, including a number of STEREO team members, traveled to Tripoli and then the Sahara desert to witness and study -- first hand -- a total solar eclipse. This international expedition was an unprecedented collaboration with Libyan scientists and researchers from across the globe. NASA produced a high definition video documentary of the expedition and its interactions with Libya academics and government officials.

New Film Opening in Boston Gives First 3D Look at the Sun

September 14, 2007

NASA's STEREO Mission, the scientists involved and the vital information that they gather and study, is being presented in a new digital 3D film titled "3D Sun." 3D Sun will bring these images to the world in a way that has only been imagined before. 3D Sun opened at the Boston Museum of Science the first week of September.

3D Photo Showcase

July 6, 2007

We invite you to send us your 3D photos so that we can feature them on our web site. The 3D effect is fun to see and we want to show off what our readers have come up with. The photos need to be in the red/cyan anaglyph mode so that all viewers can see them with standard 3D glasses. (We are willing to show Left/Right pairs (in addition to the anaglyphs).

Anatomy of a solar storm

June 7, 2007

Though we can't yet predict such storms, it's only a matter of time. Space-weather forecasters use satellites and ground-based scopes to monitor sunspots for flares and CMEs but can't tell with certainty if or when they will hit Earth. The STEREO satellites will help scientists determine whether a particular storm is headed for us and, hopefully, will give satellite and energy-grid minders enough warning to prepare for a hit.

STEREO's Press Clippings

April 25, 2007

The STEREO 3D Press Conference has received a large amount of media attention. Click here to view all the press clippings.

STEREO Ultraviolet 3D Images

April 23, 2007

The two STEREO spacecraft were launched together in Oct. 2006 from Cape Canaveral. In the following months they were placed in two separate orbits about the Sun - one (the Ahead spacecraft) moving ahead of Earth's orbit, the other (Behind) moving behind Earth's orbit. Both spacecraft are separating from each other and Earth. The spacecraft now have four degrees of separation, enough to provide true 3D images of the Sun and solar storms for the very first time.

The Sun in 3D! - Museum List

April 20, 2007

On April 23, NASA will unveil 3-D images of the sun from NASA's Solar TErrestrial RElations Observatory (STEREO) on the web, television and museums across the country. For first time, scientists will be able to see structures in the Sun's atmosphere in three dimensions.

New Solar Images Herald Better Solar Storm Tracking

March 1, 2007

NASA researchers will be discussing the remarkable imagery from the recently launched STEREO spacecraft. For the first time, scientists are now able to track solar storms from the sun to Earth using the latest images from NASA's twin STEREO spacecraft. Images supporting the telecon will be available at this site on Thursday morning.

Solar Eclipse, STEREO Style

March 1, 2007

On Feb. 25, 2007 there was a transit of the Moon across the face of the Sun - but it could not be seen from Earth. This sight was visible only from the STEREO-B spacecraft in its orbit about the sun, trailing behind the Earth.

The "Behind" spacecraft leaves Earth orbit.

January 22, 2007

Jan. 22, 2007 The "Behind" spacecraft leaves Earth orbit for its orbit about the sun. Now both spacecraft are in thier final sun-centric orbits.

Comet McNaught - A First Light Present for STEREO

January 20, 2007

An instrument on one of the two new STEREO spacecraft captured an unprecedented view of the brightest comet of the last 40 years.

STEREO First Light Press Release

December 20, 2006

NASA's twin Solar Terrestrial Relations Observatories (STEREO) sent back their first images of the sun this week and with them a view into the sun's mounting activity.

STEREO First Light Images

December 15, 2006

View the STEREO first light images.

STEREO Learning Center | Extreme Ultraviolet Images

December 15, 2006

It is not possible for the human eye to see ultraviolet light directly. Thus, the colors of these images are just ways to represent them so we can see them. To keep the images straight, we assign certain colors to EUVI images taken in particular extreme ultraviolet (EUV) wavelengths, so usually the 195 � images are in green, the 304 � images are in orange, etc.

STEREO Learning Center | Coronagraph Images

December 15, 2006

A Coronagraph is an instrument which studies the Sun's outer atmosphere, the corona. From Earth the corona is most easily seen during a total solar eclipse.

The twin STEREO spacecraft launched from Cape Canaveral Air Force Station.

October 25, 2006

The twin STEREO (Solar TErrestrial RElations Observatory) spacecraft were launched Wednesday, October 25th, at 8:52 p.m. EDT on a Delta II 7925-10L rocket from Cape Canaveral Air Force Station in Florida.