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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 12, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8334 | S25 | W35 | 02 | 0010 | BETA | Sep 10, 1998 | Sep 17, 1998 | Oct 1, 1998 |
| № 8333 | N11 | W55 | 09 | 0120 | BETA | Sep 9, 1998 | Sep 16, 1998 | Sep 29, 1998 |
| № 8331 | N25 | E14 | 20 | 0180 | BETA | Sep 14, 1998 | Sep 21, 1998 | Oct 5, 1998 |
| № 8330 | S23 | E12 | 01 | 0040 | ALPHA | Sep 14, 1998 | Sep 21, 1998 | Oct 5, 1998 |
| № 8329 | N15 | W32 | 10 | 0240 | BETA | Sep 11, 1998 | Sep 17, 1998 | Oct 1, 1998 |
| № 8328 | S18 | W20 | 06 | 0090 | BETA | Sep 11, 1998 | Sep 18, 1998 | Oct 2, 1998 |
| № 8327 | N29 | W24 | 02 | 0000 | ALPHA | Sep 11, 1998 | Sep 18, 1998 | Oct 2, 1998 |
| № 8326 | N21 | W27 | 04 | 0010 | BETA | Sep 11, 1998 | Sep 18, 1998 | Oct 2, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
