The immense sunspot group that on November 4th ejected the largest solar flare ever recorded has rotated around the Sun and is back for a second pass across the Earth-facing side of the solar disk.
A very active sunspot group is rotating to face Earth. Radio disruptions have already begun, and auroras may light the night skies.
Does your version of stargazing involve pointing your telescope at the Sun? With the right equipment, you can aid a project that aims to catch a solar flare in the act of erupting. The observing campaign is coming up soon: September 19 - 27, 2015.
A large sunspot complex will remain visible for several more days before disappearing around the Sun's limb.
Turn off the telescope's motor drive (if any). Count the number of seconds it takes for the sunspot to drift past crosshairs or any speck of dust that is visible in your eyepiece. The number of seconds equals the spot's breadth in Earth diameters. The method is approximate. If the spot is near the…
Our star is an amazing object to observe, whether by eye or with optical aid. These time-tested tips will let you see the solar disk worry-free.
After being nearly featureless for several weeks, the solar face now sports a large sunspot.
Two large sunspot groups, currently disappearing around the western limb of the Sun, spawned another round of powerful flares. The result could be one more fine display of the aurora.
The surface of the Sun is a dynamic, living place that can change unpredictably from day to day.
Michelle Thaller speaks with NASA's Alex Young about the space agency's impressive fleet of Sun-monitoring spacecraft — including the upcoming Solar Probe Plus.
A large spot is now visible on the Sun's surface. It's big enough to be seen without optical aid, but always use a safe solar filter when viewing the Sun.
For the second time in the last few days, a powerful flare on the Sun triggered an unusual display of the aurora borealis over some of the world's midlatitudes.
After weeks of having a face free of large blemishes, the Sun now sports a Jupiter-sized spot, large enough to be visible without magnification if you use a safe solar filter.
A large sunspot group has returned to the Earth-facing side of the Sun.
Sunspots change their shape and size as they travel across the face of the Sun. Catch an evolving sunspot group caught in the act.
Why are "sundogs" called by that name? Before answering the why question, let me answer the what question that comes before: namely, what is a sundog, or mock Sun, in the first place? A sundog is a concentrated patch of sunlight occasionally seen about 22° to the left or right of the Sun. Sundogs often…
The earliest sunrise of the year doesn't always occur on June 20th (the solstice), which has the longest day. Why? The earliest sunrise actually depends partly on latitude. In 2004, for latitude 40° north, it was June 13th. For 50° north, the earliest sunrise was on June 16th. At 30° south, where the seasons are…