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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.

C. Alex Young

May 1, 2022

Solar filaments, aka prominences, arc upwards

Solar filaments (aka prominences, when viewed on the limb of the sun) are large, bright arcs of solar material and magnetic fields.

C. Alex Young

March 26, 2022

Solar Orbiter passes historically close to sun on Saturday

Solar Orbiter will make a historically close pass of the sun on March 26, 2022. All 10 of its instruments will be operating to acquire close-up data.

Kelly Kizer Whitt

March 26, 2022

Mysterious Maunder Minimum: Nearby star offers clues

We may learn more about the sun's Maunder Minimum - a quiet period of low sunspots in the 1600s and 1700s - thanks to the help of a nearby sun-like star.

Kelly Kizer Whitt

March 24, 2022

Solar Cycle 25 starting with a bang!

Solar cycle 25 has already shown itself to be active, with endless sunspots and coronal mass ejections producing solar storms and aurora. Will it stay active?

Kelly Kizer Whitt

February 24, 2022

40 Starlink satellites doomed by geomagnetic storm

SpaceX is reporting 40 Starlink satellites doomed to reentry, after a storm on the sun caused a geomagnetic storm that disturbed Earth's magnetic field.

Deborah Byrd

Eddie Irizarry

February 9, 2022

Total solar eclipse of December 4, 2021

A total solar eclipse occurs December 4, 2021. The total phase sweeps over Antarctica, while the partial phase reaches southernmost points of three continents.

Fred Espenak

December 2, 2021

A storm on the sun, and a great week for auroras

Aurora alert in effect for the next few days: the sun sent out a halo coronal mass ejection on November 2, 2021, due to arrive at Earth on November 4.

Theresa Wiegert

C. Alex Young

November 4, 2021