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Longest-lasting X flares

X0.5 1978-04-28605 min

X5.7 1989-10-24528 min

X13.0 1989-10-19464 min

X1.3 1983-05-08409 min

X0.2 1979-08-26346 min

X1.0 1981-02-17330 min

X2.6 1982-02-01328 min

X1.1 1989-03-14302 min

X1.7 1992-10-30301 min

X0.3 1978-04-29293 min

X2.4 1982-06-15286 min

X7.1 1982-07-12284 min

X12.0 1991-06-15284 min

X0.5 1980-04-04272 min

X2.1 1991-08-25272 min

Date	Begin	Peak	Min	Class	Location	Region
1978-04-28	13:08	13:29	605	X0.5	N22E41	1092
1989-10-24	17:36	18:31	528	X5.7	S30W57	5747
1989-10-19	12:29	12:55	464	X13.0	S27E10	5747
1983-05-08	02:24	03:17	409	X1.3	S31E62	4171
1979-08-26	16:17	17:02	346	X0.2	N05W09	1943
1981-02-17	18:12	21:50	330	X1.0	N20W20	2941
1982-02-01	12:17	14:03	328	X2.6	S14W09	3576
1989-03-14	16:46	17:26	302	X1.1	N33W21	5395
1992-10-30	17:02	17:30	301	X1.7	S22W61	7321
1978-04-29	18:37	19:25	293	X0.3	N16E16	1092
1982-06-15	02:18	02:47	286	X2.4	N10E46	3776
1982-07-12	09:16	09:18	284	X7.1	N11E37	3804
1991-06-15	06:33	08:31	284	X12.0	N33W69	6659
1980-04-04	14:57	15:09	272	X0.5	N24W34	2363
1991-08-25	00:31	00:49	272	X2.1	N24E77	6805
1991-10-26	18:53	20:51	272	X1.7	S09E20	6891
1982-12-16	14:53	15:05	253	X1.6	S07W09	4025
1989-10-22	17:08	17:57	240	X2.9	S27W31	5747
1991-06-04	03:37	–	233	X12.0	N30E70	6659
1981-04-24	13:46	14:11	229	X5.9	N18W50	3049
1989-06-05	19:26	21:36	229	X1.0	S21E52	5521
1989-09-29	10:47	11:33	228	X9.8	–	5698
1978-04-11	13:40	14:26	224	X0.2	N19W54	1057
1982-02-03	01:03	01:26	223	X1.1	S15W29	3576
1992-02-27	09:22	12:56	221	X3.3	N06W02	7070
1989-11-25	22:55	23:24	220	X1.0	N30E05	5800
1990-05-15	12:46	13:10	207	X1.7	N42E38	6063
1991-03-07	06:11	07:48	206	X5.5	S20E66	6538
1982-12-17	18:19	18:58	204	X10.1	S08W21	4025
1991-01-31	01:58	02:22	201	X1.3	S17W35	6469
1981-04-26	10:57	12:35	199	X1.2	–	3049
1989-11-30	11:45	12:25	199	X2.6	N24W52	5800
1989-08-15	01:59	02:54	194	X1.0	S18W73	5629
1989-05-05	07:23	07:39	192	X2.4	N30E01	5470
1978-04-30	14:37	15:08	191	X0.2	N24E11	1092
1989-03-10	18:48	19:12	190	X4.5	N31E22	5395
2005-01-17	06:59	09:52	188	X3.8	N15W25	10720
1982-03-30	05:22	05:49	184	X2.8	N13W11	3659
1991-01-27	14:40	14:42	182	X1.9	S14E59	6471
1983-02-03	05:43	06:19	179	X4.1	S19W08	4077
1988-01-02	21:11	21:35	178	X1.4	S34W18	4912
1991-04-20	08:27	08:52	177	X1.0	N08W50	6583
1991-10-30	06:11	06:21	172	X2.5	S08W25	6891
1989-02-04	09:50	10:17	171	X1.5	N29E73	5354
1991-06-09	01:37	01:40	167	X10.0	N34E04	6659
1985-01-21	23:52	00:11	165	X4.7	S08W38	4617
1988-06-24	04:18	04:30	163	X1.3	S18W45	5047
1982-06-06	16:30	16:54	162	X12.0	S09E25	3763
1989-11-15	06:38	07:05	162	X3.2	N11W26	5786
1991-05-18	05:06	05:46	162	X2.8	N32W85	6619

All times UTC. Until June 2017 classes are NOAA's reports of the time (GOES-15 and earlier included a 0.7 scaling factor); later classes come from calibrated GOES-16/18 data, so the same flare reads about 1.4× larger. Do not compare the two periods directly.