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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8324 | N23 | W24 | 01 | 0000 | ALPHA | Aug 31, 1998 | Sep 7, 1998 | Sep 21, 1998 |
| № 8323 | S22 | E42 | 29 | 0890 | BETA-GAMMA | Sep 5, 1998 | Sep 12, 1998 | Sep 26, 1998 |
| № 8322 | N23 | W40 | 11 | 0090 | BETA | Aug 30, 1998 | Sep 6, 1998 | Sep 20, 1998 |
| № 8321 | N31 | E25 | 02 | 0010 | ALPHA | Sep 4, 1998 | Sep 11, 1998 | Sep 25, 1998 |
| № 8319 | N19 | W54 | 26 | 0740 | BETA | Aug 29, 1998 | Sep 5, 1998 | Sep 18, 1998 |
| № 8307 | N32 | W77 | 04 | 0090 | BETA | Aug 27, 1998 | Sep 3, 1998 | Sep 17, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
