Solar flares on October 16, 2025
The most powerful solar flare in 24 hours
M1.5 (strong) flare - October 16 at 9:28 PM
Solar activity index
Value as of the end of the day on October 16, 2025
Solar X-ray emission over the past 2 days
Chart of solar X-ray emission (1-8 Å) from October 15, 2025 to October 16, 2025
Time zone — UTC-04 (Washington) — summer time
List of solar flares for October 16, 2025
The total number of solar flares of class C and higher — 17 flares
C class — 13 | M class — 4 | X class — 0
| Class | begin | max | end | region |
|---|---|---|---|---|
| M1.5 | 21:15 | 21:28 | 21:40 | 4246 |
| M1.0 | 19:12 | 19:19 | 19:28 | 4246 |
| C5.5 | 18:38 | 18:54 | 19:02 | 4246 |
| C5.8 | 16:40 | 16:43 | 16:46 | 4246 |
| C4.4 | 16:26 | 16:35 | 16:40 | 4246 |
| M1.1 | 15:00 | 15:16 | 15:36 | 4246 |
| C4.7 | 11:59 | 12:06 | 12:08 | 4246 |
| M1.3 | 09:53 | 10:08 | 10:22 | 4246 |
| C6.0 | 09:03 | 09:08 | 09:12 | 4246 |
| C8.4 | 07:41 | 08:03 | 08:25 | 4246 |
| C5.3 | 05:53 | 06:05 | 06:14 | 4246 |
| C3.5 | 05:41 | 05:49 | 05:53 | 4246 |
| C3.3 | 04:44 | 04:49 | 04:51 | 4246 |
| C5.1 | 03:56 | 04:01 | 04:13 | 4246 |
| C4.6 | 03:24 | 03:31 | 03:36 | 4246 |
| C5.5 | 02:36 | 02:43 | 02:47 | 4246 |
| C5.2 | 00:41 | 00:46 | 01:02 | 4246 |