Sun · flares

A Sun that bursts

Flares are sudden releases of magnetic energy above active regions. The flashes in this view recall the classes of the strongest flares in the GOES catalogue (X, M); their positions are illustrative.

Latest catalogued flare

C1.5

2026-10-26 04:36 UTC

Strongest in the catalogue

X28

2003-11-04

X-class flares

558

1975 → 2026

GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26

Illustrative rendering: procedural prominence loops and flashes; classes from the GOES catalogue below.

Catalogued flares

94,047

1975 → 2026-10-26

GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26 Current · provisional

X-class flares

558

7954 M-class

GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26 Current · provisional

Latest catalogued flare

C1.5

2026-10-26 04:36 UTC · AR 14561

GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26

Strongest in the catalogue

X28

2003-11-04 18:29 UTC · S19W83

GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26

X- and M-class flares per year GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26 Current · provisional

Show the data as a table

Number of flares per calendar year in the GOES catalogue (NOAA). The current year is provisional; 2020 is marked “instrument change”: since December 2019 the flux is no longer reduced by the 0.7 factor, which raises classes by about 40%.

C-class flares per year GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26 Current · provisional

Show the data as a table

Detection of C-class flares depends on the background level, hence on the cycle phase and the instrument; these counts are less homogeneous than those of M and X classes.

Ten strongest flares (peak flux derived from the class)

#	Class	Start (UTC)	Peak	Peak flux (W/m²)	Position	Active region
1	X28	2003-11-04 18:29	18:50	3E-3	S19W83	10486
2	X20	1989-08-15 23:08	23:17	2E-3	S18W84	5629
3	X20	2001-04-02 19:32	19:51	2E-3	—	—
4	X17	2003-10-28 08:51	10:10	2E-3	—	10486
5	X17	2005-09-07 15:17	15:40	2E-3	S11E77	10808
6	X15	1989-03-06 12:54	13:10	2E-3	N35E69	5395
7	X14	2001-04-15 11:19	11:50	1E-3	S20W85	9415
8	X13	1984-04-24 21:56	22:01	1E-3	S12E43	4474
9	X13	1989-10-19 11:29	11:55	1E-3	S27E10	5747
10	X12	1982-06-06 14:30	14:54	1E-3	S09E25	3763

The peak flux (0.1–0.8 nm, W/m²) is derived from the published class, e.g. X28 = 28 × 10⁻⁴ W/m²; the GOES detectors saturated above X17 before 2003, so the 4 November 2003 flare is an estimate.

Filterable catalogue GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC) · U.S. Government work, public domain (NOAA/NASA) · 10/26/26

Year

Minimum class

Sort

Export CSV

Start (UTC)	Peak	End	Duration	Class	Peak flux (W/m²)	Position	Active region
1990-05-10 21:50	21:57	22:32	42 min	M2.1	2E-5	—	—
1990-05-10 17:18	17:30	18:28	70 min	X3.4	3E-4	—	—
1990-05-10 13:21	13:39	14:26	65 min	M3.9	4E-5	—	—
1990-05-09 02:04	02:13	02:18	14 min	M1.2	1E-5	—	—
1990-05-08 16:46	16:47	17:06	20 min	M3.3	3E-5	N15E02	6049
1990-05-07 22:22	22:24	23:05	43 min	M1.1	1E-5	S21E69	6054
1990-04-23 10:35	11:03	12:08	93 min	M1.2	1E-5	S11W33	6032
1990-04-21 05:16	05:26	06:11	55 min	M2.3	2E-5	S14W20	6021
1990-04-21 04:44	04:49	06:11	87 min	M2.3	2E-5	S14W20	6021
1990-04-20 16:18	16:22	16:52	34 min	M1.5	2E-5	S32W43	6018
1990-04-18 01:32	02:01	03:01	89 min	M1.5	2E-5	S32W09	6018
1990-04-18 00:50	01:37	02:18	88 min	M1.1	1E-5	S13E16	6021
1990-04-17 12:18	12:30	13:53	95 min	M1.4	1E-5	N26E16	6022
1990-04-16 04:30	04:36	05:32	62 min	X2.2	2E-4	S13E41	6021
1990-04-15 22:39	22:41	23:00	21 min	M2	2E-5	S31E17	6018
1990-04-15 09:47	09:51	10:13	26 min	M1	1E-5	S15E61	6021
1990-04-15 00:55	00:55	01:45	50 min	X1.4	1E-4	N32E57	6022
1990-04-14 10:20	10:32	10:50	30 min	M1	1E-5	S32E35	6018
1990-04-14 01:53	01:53	02:08	15 min	M1.3	1E-5	S32E41	6018
1990-04-13 19:16	19:24	19:45	29 min	M4.9	5E-5	S34E43	6018
1990-04-12 00:49	00:59	01:15	26 min	M3.2	3E-5	—	—
1990-04-10 09:44	09:50	11:16	92 min	M1.1	1E-5	N24W04	6007
1990-04-08 01:44	02:02	03:14	90 min	M1.5	2E-5	N24E29	6007
1990-04-05 11:35	11:45	12:35	60 min	M3.2	3E-5	N23E62	6007
1990-04-04 11:15	11:18	13:21	126 min	M7.1	7E-5	N22E72	6007
1990-04-03 15:05	15:22	16:18	73 min	X1	1E-4	N23E82	6007
1990-04-03 06:16	06:42	07:45	89 min	M7.3	7E-5	—	—
1990-04-02 23:39	23:49	00:07	28 min	M1	1E-5	—	—
1990-04-02 15:04	15:06	15:39	35 min	M1.8	2E-5	N21E39	6001
1990-04-01 03:55	04:02	04:14	19 min	M4.1	4E-5	S17W90	5987
1990-03-30 17:22	17:27	17:30	8 min	M1.8	2E-5	—	—
1990-03-28 07:32	07:36	07:44	12 min	M1.4	1E-5	N26W61	5991
1990-03-28 05:31	05:45	07:48	137 min	M4.2	4E-5	S04W37	5988
1990-03-27 02:14	02:17	02:32	18 min	M1.1	1E-5	S37W76	5974
1990-03-26 03:29	03:35	03:40	11 min	M2.3	2E-5	—	—
1990-03-26 02:09	03:06	04:22	133 min	M2.6	3E-5	S13W35	5984
1990-03-26 01:41	01:43	02:07	26 min	M3.5	4E-5	S13W30	5984
1990-03-25 17:32	17:53	18:45	73 min	M2.7	3E-5	S12W29	5984
1990-03-25 14:13	15:38	17:06	173 min	M1	1E-5	S11W26	5984
1990-03-25 09:15	09:17	09:22	7 min	M1.3	1E-5	S13W32	5984
1990-03-24 03:42	04:03	05:13	91 min	M1.2	1E-5	S06E18	5988
1990-03-24 01:54	01:55	02:09	15 min	M1.5	2E-5	S35E01	5983
1990-03-23 11:52	11:56	12:01	9 min	M1.2	1E-5	S07E31	5988
1990-03-22 04:34	04:43	05:51	77 min	M1.1	1E-5	S14E21	5984
1990-03-20 22:02	22:10	22:41	39 min	M1.8	2E-5	S33W05	5974
1990-03-20 19:25	19:26	19:50	25 min	M2.1	2E-5	S34W03	5974
1990-03-20 19:09	19:13	19:34	25 min	M1.3	1E-5	S05E63	5988
1990-03-20 14:14	14:21	15:34	80 min	M1.2	1E-5	S36E53	5983
1990-03-19 12:50	12:54	13:03	13 min	M4.2	4E-5	S14E69	5987
1990-03-19 12:12	12:16	12:37	25 min	M1.3	1E-5	S34E66	5983

Method and sources

The catalogue reproduces the NOAA (SWPC/NGDC) GOES event lists compiled yearly by the NASA GSFC Hesperia centre: start, peak and end (UT), class, heliographic position and active region when known. The class encodes the peak flux in the 0.1–0.8 nm band: C = 10⁻⁶ W/m², M = 10⁻⁵, X = 10⁻⁴, times the number (M2.3 = 2.3 × 10⁻⁵ W/m²).

Lines without an X-ray class (optical or sub-threshold events) are not imported. The last two years are re-read on each import; duplicates are rejected by start time and class. Yearly counts are computed from the imported catalogue.

Reading these data

Until December 2019 NOAA applied a 0.7 factor to the XRS-B flux of GOES 8 to 15; since GOES-16 became the primary satellite the raw flux is used. For the same physical flux, a class after 2020 is therefore about 1.4 times higher (Janssens et al., 2025). Counts before and after 2020 are not directly comparable.

SOURCES OF THIS PAGE

GOES X-ray flare lists (NOAA SWPC/NGDC events, yearly compilations by NASA GSFC): NOAA SWPC/NGDC GOES X-ray flare event lists (1975–), yearly compilations by K. Tolbert, NASA GSFC Hesperia. Flare classes as reported by NOAA at the time: until December 2019 the XRS-B flux carried a 0.7 scaling factor (Janssens et al., 2025). · source page ↗
Licence : U.S. Government work, public domain (NOAA/NASA) · retrieved on Oct 26, 2026 · SHA-256 d24560b7385e…
Janssens (2025): Janssens, J., et al. (2025). Solar flare rates and probabilities based on the McIntosh classification: impacts of GOES/XRS rescaling and recalibration. Journal of Space Weather and Space Climate. · doi:10.1051/swsc/2025007
Licence : Published literature; cited

Solar flares GOES X-ray flare catalogue since 1975

A Sun that bursts