Solar flares

Track recent solar flares and their strength. A flare is a burst of light and radiation, not a promise of a geomagnetic storm or aurora.

Aurora Forecast

Solar X-ray flux

B3.3 3.25e-7 W/m²
Observed

Flare strength runs from A through B, C and M to X. At the same number, each letter class is ten times stronger than the previous one.

Delayed data · Oct 31, 2026, 21:21 UTCNOAA SWPC

Sunspot regions

Sunspot regions
NASA SDO / HMI

Flare probability

Forecasts & alerts →
C25%
Forecast · Oct 31, 2026, 00:00
M1%
Forecast · Oct 31, 2026, 00:00
X1%
Forecast · Oct 31, 2026, 00:00

Solar flares

GOES · NOAA SWPC
DatePeakTimeEnd
Oct 31, 2026, 20:44B4.0Oct 31, 2026, 20:51Oct 31, 2026, 21:06
Oct 31, 2026, 20:32B3.6Oct 31, 2026, 20:37Oct 31, 2026, 20:44
Oct 31, 2026, 19:47B5.9Oct 31, 2026, 19:55Oct 31, 2026, 20:02
Oct 31, 2026, 19:05B4.1Oct 31, 2026, 19:13Oct 31, 2026, 19:31
Oct 31, 2026, 15:35B3.8Oct 31, 2026, 15:42Oct 31, 2026, 15:44
Oct 31, 2026, 15:13B3.6Oct 31, 2026, 15:20Oct 31, 2026, 15:25
Oct 31, 2026, 09:01B6.3Oct 31, 2026, 09:14Oct 31, 2026, 09:24
Oct 31, 2026, 06:08B3.4Oct 31, 2026, 06:13Oct 31, 2026, 06:21
Oct 31, 2026, 03:07B3.2Oct 31, 2026, 03:21Oct 31, 2026, 03:27
Oct 31, 2026, 01:05B4.5Oct 31, 2026, 01:11Oct 31, 2026, 01:16
Oct 30, 2026, 23:38B3.6Oct 30, 2026, 23:42Oct 30, 2026, 23:48
Oct 30, 2026, 23:20B3.4Oct 30, 2026, 23:24Oct 30, 2026, 23:27
Oct 30, 2026, 22:21B5.1Oct 30, 2026, 22:38Oct 30, 2026, 22:47
Oct 30, 2026, 15:54B5.7Oct 30, 2026, 16:07Oct 30, 2026, 16:19
Oct 30, 2026, 13:08B7.3Oct 30, 2026, 13:22Oct 30, 2026, 13:28
Oct 28, 2026, 12:38B6.4Oct 28, 2026, 12:52Oct 28, 2026, 13:03
Oct 28, 2026, 10:56B6.3Oct 28, 2026, 11:09Oct 28, 2026, 11:17
Oct 28, 2026, 08:13B8.4Oct 28, 2026, 08:39Oct 28, 2026, 08:59
Oct 28, 2026, 06:00C1.0Oct 28, 2026, 06:13Oct 28, 2026, 06:24
Oct 28, 2026, 04:54B6.0Oct 28, 2026, 04:59Oct 28, 2026, 05:03
Oct 28, 2026, 04:38B4.4Oct 28, 2026, 04:45Oct 28, 2026, 04:50
Oct 28, 2026, 03:16B7.9Oct 28, 2026, 03:23Oct 28, 2026, 03:31
Oct 28, 2026, 01:43B5.9Oct 28, 2026, 01:49Oct 28, 2026, 01:53
Oct 28, 2026, 00:13B5.4Oct 28, 2026, 00:23Oct 28, 2026, 00:35
Oct 27, 2026, 21:12B6.2Oct 27, 2026, 21:19Oct 27, 2026, 21:26
Oct 27, 2026, 17:38B4.2Oct 27, 2026, 17:46Oct 27, 2026, 18:02
Oct 27, 2026, 09:26B3.7Oct 27, 2026, 09:32Oct 27, 2026, 09:34
Oct 27, 2026, 05:10B3.9Oct 27, 2026, 05:18Oct 27, 2026, 05:22
Oct 27, 2026, 02:34C1.1Oct 27, 2026, 02:48Oct 27, 2026, 02:55
Oct 26, 2026, 21:55B4.7Oct 26, 2026, 22:02Oct 26, 2026, 22:04
Oct 26, 2026, 20:18B8.4Oct 26, 2026, 20:22Oct 26, 2026, 20:26
Oct 26, 2026, 18:17C2.8Oct 26, 2026, 18:40Oct 26, 2026, 19:02
Oct 26, 2026, 17:27B9.4Oct 26, 2026, 17:36Oct 26, 2026, 17:41
Oct 26, 2026, 13:50B6.0Oct 26, 2026, 13:58Oct 26, 2026, 14:04
Oct 26, 2026, 12:07B8.4Oct 26, 2026, 12:17Oct 26, 2026, 12:24
Oct 26, 2026, 11:29B7.5Oct 26, 2026, 11:35Oct 26, 2026, 11:39
Oct 26, 2026, 11:22B5.3Oct 26, 2026, 11:26Oct 26, 2026, 11:29
Oct 26, 2026, 10:13B7.7Oct 26, 2026, 10:18Oct 26, 2026, 10:27
Oct 26, 2026, 08:21C1.9Oct 26, 2026, 08:38Oct 26, 2026, 08:51
Oct 26, 2026, 07:39B7.9Oct 26, 2026, 07:48Oct 26, 2026, 08:00
1 / 2

What do start, peak and end times tell me?

The peak marks the strongest X-ray emission, not the flare’s duration or a CME arrival. All table times use UTC.

How do A, B, C, M and X compare?

Flare strength runs from A through B, C and M to X. At the same number, each letter class is ten times stronger than the previous one.

How should I read a flare probability?

It is the chance of that flare class during the stated period, not its duration. C, M and X probabilities need not add up to 100%.

Public scientific observations and forecasts may be delayed or revised. Forecasts are not guarantees of aurora visibility or operational safety. Follow official advice for critical decisions.