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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 23, 1998. Coordinates are given as of the end of the day.
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 8344 | S20 | E20 | 05 | 0010 | BETA | Sep 26, 1998 | Oct 3, 1998 | Oct 16, 1998 |
| № 8343 | N39 | E23 | 08 | 0020 | BETA | Sep 26, 1998 | Oct 3, 1998 | Oct 18, 1998 |
| № 8342 | N18 | W02 | 08 | 0070 | BETA | Sep 24, 1998 | Oct 1, 1998 | Oct 15, 1998 |
| № 8340 | N20 | E09 | 28 | 0380 | BETA | Sep 25, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8339 | S16 | W27 | 10 | 0050 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8338 | N32 | E03 | 01 | 0070 | ALPHA | Sep 24, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8336 | S29 | W29 | 13 | 0070 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8335 | S20 | W70 | 01 | 0050 | ALPHA | Sep 19, 1998 | Sep 26, 1998 | Oct 9, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
