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Large amounts of plasma (consisting of mostly electrons and protons) ejected from the sun.
Gamma-Ray Bursts
Short bursts of gamma-rays (very high frequency electromagentic radiation) with very energetic explosions. These bursts can last from a few milliseconds to a few about an hour.
Geomagnetic Storms
A disturbance in the Earth's magnetosphere caused by changes in space weather such as solar erutptions.
The region around the sun that is filled with the Sun's gases, solar winds, and magentic fields.
The magnetic field produced by the Sun that is carried through by solar winds.
The uppermost part of the atmosphere. It also forms the inner surface of the magnetosphere and is reponsible for radio communication between distant places on Earth.
Lagrangian Point
Equilibrium points in space where the gravitational pull by a massive body is equal to that of another body.
Forms when a stream of charged particles, such as a solar wind, interacts with the magnetic field of a planet.
The surface of the sun that you see.
Solar Eruptions
These are sudden intense bursts of energy in the sun. They may develop in a few minutes and last for several hours.
Solar Wind
A constant stream pf charged particles, such as electrons and protons, that are continuously ejected from the upper atmosphere of the Sun.
Suprathermal Ions
Ions, charged particles, that have more energy than similar particles of the same type.

Can’t find the word here? Check out our full glossary

Archive 2007

Nov 29, 2007

The STEREO science center now has the real-time IMPACT and SWAVES data up. Check out their website to see what the solar wind and solar magnetic field (interplanetary magnetic field) is doing right now, as measured by the two STEREO satellites. Today the Sun is still VERY quiet. We are in solar minimum and there are no waves to be seen, the magnetic field data is relatively steady, and there are very few high energy particles - just the normal solar wind is blowing out with its magnetic field, past Earth and all the other planets in our solar system.

Oct 24, 2007

Naked Science - "Solar Force" TV show, which prominently features STEREO will be premiering on the National Geographic Channel Oct. 30 at 9:00 ET. Check out this link for more information. After this time, the program will replay a number of times.

Oct 15, 2007

The Sun has been incredibly quiet. Only coronal holes have opened up the Sun to connect high speed particles that interact with Earth's magnetic field to add energy to Earth's magnetosphere, enhancing auroras. This has been a great time for the STEREO team to study these coronal holes and streamers and other things, like the interaction of the solar wind with comets. To read more about a case when STEREO saw a comet's tail get swept away but the solar wind, visit NASA's STEREO mission web site or the New Scientists' web page.

Aug 9, 2007

Mary Quinn playing solar music while holding a model of STEREO Marty Quinn of Quinn Arts, plays his solar music while holding a model of the STEREO spacecraft. Mr. Quinn is working with the STEREO Education and Public Outreach (E/PO) teams to create a museum exhibit that takes the STEREO data and turns it in music.
View the full resolution image.

June 25, 2007

A new Flash animation has been added to STEREO-Impact In the Classroom. See what happens to the Earth and the STEREO satellites during a Coronal Mass Ejection (CME).

April 23, 2007

Check out the first STEREOscopic images released at NASA's STEREO site.

Mar 14, 2007

The education sounds project has created a new page with STEREO IMPACT and SWAVES data. Listen to the newest STEREO data on this "Latest sounds of STEREO" website.
The scientific instruments on the STEREO satellites are still be tested to make sure they are working correctly. From these tests, it appears that the STEREO A satellite will not have a working Solar Wind plasma Electron Analyzer (SWEA) instrument, but the STEREO B satellite's SWEA is working well and should provide important data to the science team. Some instruments are already providing data that

Mar 12, 2007

No human has ever witnessed a solar eclipse quite like this: NASA's STEREO-B spacecraft was about a million miles from Earth last month when it photographed the Moon passing in front of the Sun. The resulting movie looks like it came from an alien solar system. Read the full story at Science@NASA Headlines.
Note that this story is wrong in its explanations of the STEREO calibration. The SOHO release on the 1999 transit of Mercury got it right: "The difficulty in obtaining accurate data from coronal measurements is caused by the amount of light coming from the solar disk (much brighter than the dim corona) that bounces around inside the instruments. This scattered light is also referred to by scientists as stray light. "From SOHO's perspective, 1.5 million kilometers from Earth, the closest approach of Mercury to the Sun was at an angle of about 92 arc seconds. The planet passed just above the disk, right in front of the corona. By so doing, the planet intercepted a small part of the coronal light." "Whatever is not black inside the shadow image of Mercury is scattered light inside the instrument. Distinguishing between light from the solar disk and that from the corona will allow more refined measurements of the corona."

Feb 28, 2007

This page has been updated with a link to the NASA animation and graphics page for STEREO. Visit that on the left if you would like to find STEREO animations and graphics to use for free.

Feb 22, 2007

IMPACT produces its first science nugget about a Solar Energetic Particle event and Coronal Mass Ejection (CME) measured by the STEREO IMPACT instruments December 5-16th. This event was somewhat surprising because of the current quiet state of the Sun, near the minimum phase of its activity cycle. To read the science nugget, visit the IMPACT science news and events page.

Jan 25, 2007

Baltimore Examiner posted this article about STEREO today. The Baltimore Sun also wrote an informative article about the STEREO mission. See Articles section.

Jan 23, 2007

A press release from The Applied Physics Laboratory at Johns Hopkins University about the STEREO mission as well as STEREO's recent swing past the Moon. See Articles section.

Jan 22, 2007

STEREO has now started its science mission! The STEREO satellites completed a series of complex maneuvers using the moon's gravity to position the spacecraft in their mission orbits around the Sun. The spacecraft will be in position to produce the first 3-D images of the Sun by April. The Applied Physics Laboratory (APL) has a full press release with photos, which can be found at: here.

Articles About STEREO/IMPACT

Scientists wowed by Sun images. (HTML articles published at The Baltimore Sun) - 26 January 2007

Hopkins and NASA to monitor solar flares. (PDF article published at Baltimore Examiner) - 25 January 2007

Twin APL_Built Spacecraft Swing Past Moon, Preparing for 3-D Solar Studies (HTML article published at APL @ Johns Hopkins University) - 23 January 2007

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