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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 28, 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 | S28 | E03 | 12 | 0070 | BETA | Sep 29, 1998 | Oct 6, 1998 | Oct 20, 1998 |
| № 8344 | S21 | W46 | 01 | 0030 | ALPHA | Sep 25, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8342 | N17 | W70 | 02 | 0070 | BETA | Sep 24, 1998 | Sep 30, 1998 | Oct 14, 1998 |
| № 8340 | N19 | W52 | 08 | 0300 | BETA | Sep 25, 1998 | Oct 2, 1998 | Oct 15, 1998 |
| № 8339 | S15 | W82 | 03 | 0080 | BETA | Sep 23, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8338 | N31 | W56 | 01 | 0070 | ALPHA | Sep 24, 1998 | Oct 2, 1998 | Oct 16, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
