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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 25, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8346 | S30 | E41 | 05 | 0040 | BETA | Sep 29, 1998 | Oct 6, 1998 | Oct 20, 1998 |
| № 8345 | N22 | W06 | 04 | 0010 | BETA | Sep 26, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8344 | S20 | W04 | 14 | 0070 | BETA-GAMMA-DELTA | Sep 26, 1998 | Oct 3, 1998 | Oct 16, 1998 |
| № 8343 | N38 | W00 | 08 | 0010 | BETA | Sep 26, 1998 | Oct 3, 1998 | Oct 18, 1998 |
| № 8342 | N18 | W28 | 03 | 0060 | BETA | Sep 24, 1998 | Oct 1, 1998 | Oct 14, 1998 |
| № 8340 | N20 | W15 | 25 | 0520 | BETA-GAMMA-DELTA | Sep 25, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8339 | S16 | W56 | 01 | 0000 | ALPHA | Sep 22, 1998 | Sep 29, 1998 | Oct 12, 1998 |
| № 8338 | N32 | W21 | 01 | 0060 | ALPHA | Sep 24, 1998 | Oct 1, 1998 | Oct 16, 1998 |
| № 8336 | S28 | W54 | 05 | 0030 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
