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Solar flares in September 1998
C-class103
M-class9
X-class0
LargestM7.11998-09-23
Sunspot number119.0NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 1997 | 77 | 6 | 0 | M5.9 |
| September 1998 | 103 | 9 | 0 | M7.1 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1998-09-23 | 06:40 | 07:13 | 51 | M7.1 | N18E09 | 8340 |
| 1998-09-28 | 06:49 | 06:54 | 8 | M3.5 | – | – |
| 1998-09-09 | 04:52 | 04:58 | 13 | M2.8 | – | – |
| 1998-09-02 | 16:44 | 17:07 | 34 | M2.2 | N17W79 | 8319 |
| 1998-09-11 | 15:58 | 16:03 | 9 | M2.1 | N11W51 | 8333 |
| 1998-09-20 | 02:33 | 02:51 | 55 | M1.8 | – | – |
| 1998-09-01 | 04:49 | 04:59 | 17 | M1.5 | N32W78 | 8323 |
| 1998-09-03 | 03:45 | 04:21 | 55 | M1.3 | – | – |
| 1998-09-03 | 15:26 | 16:08 | 75 | M1.1 | S20E06 | 8323 |
| 1998-09-28 | 11:56 | 12:01 | 10 | C9.5 | – | – |
| 1998-09-23 | 00:27 | 00:38 | 19 | C9.3 | S20E22 | – |
| 1998-09-13 | 18:16 | 18:25 | 13 | C8.3 | N11W80 | 8333 |
| 1998-09-28 | 16:05 | 16:10 | 8 | C6.8 | – | – |
| 1998-09-29 | 01:54 | 02:02 | 15 | C6.1 | N23W69 | 8340 |
| 1998-09-24 | 08:09 | 08:14 | 10 | C6.0 | S20E05 | 8344 |
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
112 flares of class C or larger in September 1998; by M/X count it ranks 253 of 565 months.