Solar flare today: is the Sun active right now?
Live data check: August 29, 2026, 11:38 UTC. Source: NOAA GOES X-ray flux. This block is rewritten every morning.
Yes. The strongest flare of the past 24 hours was a B6.1, peaking at 07:26 UTC, a small one, the routine kind. Over the past 7 days the Sun produced 0 X-class, 7 M-class, and 26 C-class flares; the strongest was an M6.9 on August 25, 2026.
Here is the part most space weather coverage skips: the Sun flares nearly every day. The honest question is not whether a flare happened, but whether today's was a quiet C-class that nobody felt or an X-class that knocked out shortwave radio across half the planet. Lumara answers that in one line, pulled live from NASA, so you do not have to read a forecast bulletin to find out.
How to check if there is a flare today.
Open the Lumara dashboard and look at the space weather strip. It reads the latest solar flare straight from NASA's DONKI database and shows its class, so a glance tells you whether the Sun is sitting quiet or throwing real energy. Next to it you get recent coronal mass ejections and the current geomagnetic storm level, which is the chain that actually reaches Earth. No login, no ads, and the data is the same feed professional forecasters watch.
What the flare classes mean.
Flares are graded by peak X-ray output, and the scale is multiplicative. Each letter is ten times stronger than the one before it, so an X1 is a hundred times the energy of a C1.
| Class | What it means on Earth |
|---|---|
| B | Background level. No effect at the ground. |
| C | Small. Common, and usually unnoticed. |
| M | Medium. Brief radio blackouts near the poles, minor radiation bumps for aircraft on polar routes. |
| X | Strongest. Can black out shortwave radio across the daylit side of Earth, and paired with an eruption, can light up aurora far from the poles. |
Seeing the flare, not just reading about it.
A flare is a burst of radiation from a magnetically tangled region on the Sun, and it shows up best in specific wavelengths. The 131 and 94 angstrom channels are tuned to the millions-of-degrees plasma that lights up during a flare, which is why those views look nearly black on a calm day and then flash bright when a region erupts. Lumara streams all twelve NASA wavelengths, so on an active day you can actually watch the spot that produced the number. The live NASA Sun image guide breaks down what each channel reveals.
What a big flare actually does.
The flare itself is light, so it arrives in eight minutes and the atmosphere absorbs it long before it reaches you. The knock-on effects are what matter. Strong flares ionize the upper atmosphere and disrupt the high-frequency radio that pilots and ham operators rely on. They can nudge GPS accuracy. And the big ones often travel with a coronal mass ejection, a slower cloud of plasma that takes a day or two to cross to Earth and can trigger the geomagnetic storms that drive the northern lights.
On August 12, 2026 the Sun goes dark over Iceland and northern Spain: see the total solar eclipse guide.
Common questions.
Is there a solar flare today?
Almost certainly a small one. The Sun produces low-level C-class flares most days. What changes day to day is the size. Lumara shows the latest flare and its class live from NASA DONKI, so you can see at a glance whether today is quiet or active.
What do the solar flare classes B, C, M, and X mean?
They rank a flare by its peak X-ray brightness, and each step is ten times stronger than the one below. B and C are minor and harmless at the ground. M can cause brief radio blackouts near the poles. X is the strongest and can black out shortwave radio across the daylit side of Earth.
Can a solar flare affect me on the ground?
Earth's atmosphere absorbs the radiation, so a flare is not a health risk on the ground. Large flares can disrupt shortwave radio, GPS accuracy, and satellites, and the eruptions that often come with them can push aurora to lower latitudes a day or two later.
Where does Lumara get its solar flare data?
From NASA's DONKI feed, the same space weather database that forecasters use, updated in real time. It is free in Lumara with no account and no tracking.