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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8338 | N31 | E82 | 01 | 0090 | ALPHA | Sep 24, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8337 | S39 | E43 | 02 | 0010 | BETA | Sep 21, 1998 | Sep 29, 1998 | Oct 14, 1998 |
| № 8336 | S30 | E53 | 02 | 0040 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8335 | S22 | E15 | 06 | 0110 | BETA | Sep 19, 1998 | Sep 26, 1998 | Oct 10, 1998 |
| № 8331 | N26 | W44 | 03 | 0020 | BETA | Sep 15, 1998 | Sep 21, 1998 | Oct 5, 1998 |
| № 8330 | S24 | W51 | 01 | 0000 | ALPHA | Sep 14, 1998 | Sep 21, 1998 | Oct 5, 1998 |
| № 8328 | S15 | W88 | 01 | 0010 | ALPHA | 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.
