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Sun glossary: A list of solar terms and their definitions
The active sun is frequently in the news as Solar Cycle 25 ramps up. Here's a handy sun glossary so you can get up to speed on all the solar terms you'll see.
January 9, 2023
Sun activity archive for October 2022
Bottom line: Sun activity archive for October 2022. A daily record of flaring, big filaments and prominences, and other sorts of activity, on our local star.
October 31, 2022
What causes an aurora, the northern or southern lights?
The aurora, or northern and southern lights, occur when charged particles from the sun interact with Earth's magnetic field. Read more here.
September 8, 2022
CME strikes Solar Orbiter before Venus flyby
On September 4, 2022, during a close flyby of Venus, Solar Orbiter was hit by a large CME. Fortunately, the spacecraft was unharmed.
September 5, 2022
Limb darkening is an optical effect on the sun
Limb darkening is an effect we can see on the sun where the edges of the sun are darker than the center, due to the amount of photosphere we're looking at.
August 1, 2022
Geomagnetic storms: Will you lose power where you live?
Scientists studied past geomagnetic storms to learn more about how strong storms affect the power grid. The maps here show areas most at risk.
June 29, 2022
The sun as you’ve never seen it
ESA's Solar Orbiter reached perihelion, its closest point to the sun, in March. Here are stunning closeup images as never seen before.
May 22, 2022
Why are east and west on the sun reversed?
East and west on the sun are opposite from what you might expect. On the sun, east is to the left and west is to the right. Learn why here.
May 3, 2022
A Grand Solar Minimum? Or a normal sun?
A Grand Solar Minimum happens when the peaks of several solar cycles in a row show less than average intensity. Are we in one?
May 2, 2022
What does the sun’s X-ray flux tell us?
Solar physicists often speak of the sun's X-ray flux as being high, or low. Solar flares are like waves on the background ocean of the sun's X-ray flux.
May 1, 2022
