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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8335 | S22 | E70 | 04 | 0030 | BETA | Sep 19, 1998 | Sep 26, 1998 | Oct 10, 1998 |
| № 8334 | S25 | W45 | 06 | 0030 | BETA | Sep 10, 1998 | Sep 17, 1998 | Oct 1, 1998 |
| № 8333 | N11 | W69 | 05 | 0230 | BETA | Sep 9, 1998 | Sep 15, 1998 | Sep 29, 1998 |
| № 8331 | N25 | E04 | 25 | 0160 | BETA | Sep 14, 1998 | Sep 21, 1998 | Oct 5, 1998 |
| № 8330 | S23 | E02 | 01 | 0130 | ALPHA | Sep 14, 1998 | Sep 21, 1998 | Oct 5, 1998 |
| № 8329 | N14 | W44 | 03 | 0210 | BETA | Sep 11, 1998 | Sep 17, 1998 | Oct 1, 1998 |
| № 8328 | S18 | W32 | 04 | 0080 | 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.
