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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 7, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8331 | N25 | E74 | 01 | 0080 | ALPHA | Sep 14, 1998 | Sep 21, 1998 | Oct 5, 1998 |
| № 8330 | S20 | E68 | 03 | 0050 | BETA | Sep 13, 1998 | Sep 20, 1998 | Oct 4, 1998 |
| № 8329 | N15 | E38 | 14 | 0200 | BETA | Sep 11, 1998 | Sep 18, 1998 | Oct 1, 1998 |
| № 8328 | S16 | E45 | 05 | 0120 | BETA | Sep 11, 1998 | Sep 18, 1998 | Oct 2, 1998 |
| № 8327 | N30 | E39 | 03 | 0030 | BETA | Sep 11, 1998 | Sep 18, 1998 | Oct 2, 1998 |
| № 8326 | N22 | E39 | 11 | 0080 | BETA | Sep 11, 1998 | Sep 18, 1998 | Oct 2, 1998 |
| № 8323 | S22 | W36 | 35 | 1180 | BETA-GAMMA | Sep 5, 1998 | Sep 12, 1998 | Sep 26, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
