Solar Flare WatchHome › Flare history › Region ranking
Solar flares from active region 8645
C23
M5
X0
LargestM1.91999-08-05
Span15 days
Flares by day
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5
4
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All flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1999-07-23 | 15:54 | 16:01 | 19 | M1.0 | – | 8645 |
| 1999-07-24 | 22:39 | 22:43 | 9 | C2.6 | S26E68 | 8645 |
| 1999-07-25 | 00:57 | 01:03 | 8 | C5.2 | S29E70 | 8645 |
| 1999-07-25 | 04:14 | 04:32 | 24 | M1.0 | S26E58 | 8645 |
| 1999-07-26 | 18:33 | 18:36 | 7 | C1.4 | S26E38 | 8645 |
| 1999-07-27 | 08:52 | 08:57 | 10 | C2.7 | S26E40 | 8645 |
| 1999-07-28 | 12:43 | 13:23 | 54 | C2.0 | N20W72 | 8645 |
| 1999-07-28 | 17:54 | 18:12 | 41 | C7.7 | S19E22 | 8645 |
| 1999-07-29 | 16:22 | 16:56 | 55 | M1.3 | S23E08 | 8645 |
| 1999-07-31 | 00:21 | 00:24 | 5 | C2.3 | N25E34 | 8645 |
| 1999-07-31 | 09:24 | 09:29 | 14 | C2.4 | S26W21 | 8645 |
| 1999-07-31 | 17:49 | 17:56 | 18 | C3.1 | N02E00 | 8645 |
| 1999-08-01 | 06:38 | 06:45 | 10 | C9.2 | – | 8645 |
| 1999-08-01 | 09:04 | 09:07 | 5 | C3.6 | S23W23 | 8645 |
| 1999-08-01 | 12:44 | 12:51 | 14 | C3.3 | S23W33 | 8645 |
| 1999-08-01 | 15:35 | 15:39 | 9 | C4.7 | S22W31 | 8645 |
| 1999-08-01 | 23:10 | 23:14 | 7 | C4.3 | S28W27 | 8645 |
| 1999-08-02 | 04:43 | 04:49 | 14 | C3.9 | S21W35 | 8645 |
| 1999-08-02 | 05:28 | 05:32 | 8 | C5.8 | S28W28 | 8645 |
| 1999-08-02 | 11:48 | 11:52 | 11 | C6.3 | S30W29 | 8645 |
| 1999-08-02 | 14:43 | 14:50 | 11 | C6.9 | S27W40 | 8645 |
| 1999-08-03 | 11:34 | 11:40 | 14 | C4.6 | S28W42 | 8645 |
| 1999-08-04 | 11:56 | 12:01 | 12 | C4.2 | S30W67 | 8645 |
| 1999-08-04 | 12:17 | 12:20 | 8 | C2.2 | S26W64 | 8645 |
| 1999-08-05 | 15:55 | 16:23 | 38 | M1.9 | S31W69 | 8645 |
| 1999-08-05 | 18:47 | 18:52 | 9 | C3.4 | S27W80 | 8645 |
| 1999-08-06 | 02:40 | 02:59 | 35 | C4.2 | S29W73 | 8645 |
| 1999-08-06 | 16:28 | 16:36 | 17 | M1.8 | S30W85 | 8645 |
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.
About this page
NOAA active region 8645 produced 28 C+ flares between 1999-07-23 and 1999-08-06.