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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8327 | N30 | E78 | 01 | 0050 | ALPHA | Sep 11, 1998 | Sep 18, 1998 | Oct 2, 1998 |
| № 8326 | N19 | E73 | 02 | 0100 | BETA | Sep 11, 1998 | Sep 17, 1998 | Oct 1, 1998 |
| № 8325 | S31 | E32 | 01 | 0000 | ALPHA | Sep 8, 1998 | Sep 15, 1998 | Sep 29, 1998 |
| № 8323 | S22 | E03 | 33 | 1460 | BETA-GAMMA | Sep 5, 1998 | Sep 12, 1998 | Sep 26, 1998 |
| № 8322 | N22 | W79 | 05 | 0050 | BETA | Aug 30, 1998 | Sep 6, 1998 | Sep 20, 1998 |
| № 8321 | N31 | W13 | 02 | 0010 | ALPHA | Sep 4, 1998 | Sep 11, 1998 | Sep 25, 1998 |
| № 8319 | N21 | W89 | 03 | 0190 | ALPHA | Aug 29, 1998 | Sep 5, 1998 | Sep 19, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
