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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

Current News

April 09, 2012

Scientist observes 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.
To read full story, click here.

March 16, 2012

STEREO Mission Wins Public Accolades for 2011 Triumph
To read full story, click here.

October 5, 2010

Researchers using data from NASA's STEREO spacecraft have found that solar storms don't always travel in a straight line. This adds a surprising new twist to the science of space weather forecasting.
To read full story, click here.

September 9, 2010

Readers in the USA and Canada, for the next week or so, the US Air Force's "secret" X-37B space plane will be making visible passes over many North American towns and cities. Both the International Space Station and the US Air Force X-37B space plane are making a series of favorable passes over North American towns and cities. The spacecraft are easy to find using our Simple Satellite Tracker--an app for iPhones and Android.
To see the full story, go to spaceweather.com

September 9, 2010

Earth Dodges Another Bullet: Just as sunspot 1105 was turning away from Earth on Sept 8th, the active region unleashed a spectacular eruption of plasma and extreme ultraviolet radiation. Earth was not in the line of fire--this time. If such a CME did hit Earth's magnetic field, it would probably trigger strong geomagnetic storms.
To see the full sotry, go to spaceweather.com

September 5, 2010

http://spaceweather.com -- On Sept. 4th around 1600 UT, a magnetic filament erupted, hurling a bright coronal mass ejection (CME) off the sun's northwestern limb. The CME is not expected to hit Earth. Nevertheless, auroras are possible in the nights ahead. A solar wind stream flowing from a coronal hole is heading our way, due to arrive on Sept. 5th or 6th. NOAA forecasters estimate a 50% chance of high-latitude geomagnetic activity when the solar wind hits. With the approach of northern autumn, Arctic nights are getting dark again--dark enough to see the Northern Lights. People in Alaska, Canada and Scandinavia should keep an eye on the night sky this weekend.

August, 20, 2010

With solar activity on the rise, August 2010 has been a good month for auroras. There have been sightings of Northern Lights as far south as Wisconsin and Iowa in the United States, and some fine displays of Southern Lights over Antarctica. Some of the best pictures so far have come from Earth orbit, where astronauts have a front-row seat for geomagnetic storms.
Visit spaceweather.com for latest images from the International Space Station.

March 30, 2010

"RADIO-ACTIVE" SUNSPOT: Over the weekend, big sunspot 1057 emitted a series of radio bursts that caused roaring sounds to issue from the loudspeakers of shortwave receivers. Visit March 29th edition of http://spaceweather.com to hear a sample "roar" and to find out how you can build your own solar radio burst monitor.

March 30, 2010

Sunday in new Mexico, a startling roar issued from the loudspeaker of amateur astronomer Thomas Ashcraft's radio telescope. "It was sunspot 1057," he says. "All day long it had been producing small radio bursts around 21 MHz. Then, at 1813 UT, it let loose a big one. The burst only lasted a minute, but it saturated the radios."
For full story click here.

March 12, 2010

NASA solar physicist David Hathaway reports that the top of the Sun's Great Conveyor Belt has been running at record-high speeds for the past five years.
For full story click here.

January 1, 2010

Happy new year everybody!
Enjoy this picture of northern lights with a meteor from December's Geminid meteor shower.
For full story click here

November 24, 2009

Years ago, when solar physicists first witnessed a towering wave of hot plasma racing along the sun's surface, they doubted their senses. The scale of the thing was staggering. It rose up higher than Earth itself and rippled out from a central point in a circular pattern millions of kilometers in circumference. Skeptical observers suggested it might be a shadow of some kind—a trick of the eye—but surely not a real wave.
For full story click here

November 11, 2009

Science now has a more definitive and reliable tool for measuring the sun's rotation when sunspots aren't visible.
For full story click here

November 2, 2009

The Extreme Ultraviolet Imaging Spectrometer (EIS), on board the Japanese-UK-US Hinode satellite, is now generating unprecedented observations enabling scientists to provide a new perspective on the 50-year old question of how solar wind is driven.
For full story click here

September 11, 2009

UCLA atmospheric scientists have discovered a previously unknown basic mode of energy transfer from the solar wind to the Earth's magnetosphere. The research, federally funded by the National Science Foundation, could improve the safety and reliability of spacecraft that operate in the upper atmosphere.
For full story click here

September 3, 2009

Dr. Laura Peticolas discusses her research, her inspiration and how and why scientists sonify data. Podcasted from a talk given at the Exploratorium.
Click here to download her talk (.mp3, 29MB)
Click here for more information

September 1, 2009

Researchers at the University of Warwick have found what could be the signal of ideal wave “surfing” conditions for individual particles within the massive turbulent ocean of the solar wind. The discovery could give a new insight into just how energy is dissipated in solar system sized plasmas such as the solar wind and could provide significant clues to scientists developing fusion power which relies on plasmas.
For full story click here

April 14, 2009

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.
For full story click here.

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.
For full story click here.

Feb 13, 2009

Yesterday, Feb. 12th at 1625 UT, an ultraviolet telescope onboard NASA's STEREO-B spacecraft recorded the following images of a faint yet powerful "solar tsunami" eruption through the Sun's lower atmosphere:

The solar activity has been attributed to Sunspot 1012 which has been crackling with B-class solar flares of late. The low latitude and magnetic polarity of this sunspot identify it as a member of old Solar Cycle 23. It is, in other words, a fossil, albeit a relatively active one. Stay tuned for more flares. (via Spaceweather.com)

Jan 28, 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. After two years in solar orbit, the two spacecraft have finally reached quadrature.
For full story click here.

Articles About STEREO/IMPACT

Anatomy of a Coronal Mass Ejection: Briefing Material (HTML article published at NASA.gov)
- 14 April 2009

Join STEREO and Explore Gravitational "Parking Lots" That May Hold Secret of Moon's Origin (HTML article published at NASA.gov)
- 9 April 2009

STEREO in Quadrature (HTML article published at NASA.gov)
- 28 January 2009

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

Probe's close-up of Sun eruption (HTML article published at BBC News)
- 29 November 2006

A 3-D Look at The Sun's Eruptions> (HTML article published at Popular Science)
- 13 November 2006

Last updated 07/05/2012 © UC Regents