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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8343 | N37 | E49 | 01 | 0000 | ALPHA | Sep 26, 1998 | Oct 3, 1998 | Oct 18, 1998 |
| № 8342 | N18 | E27 | 08 | 0040 | BETA | Sep 24, 1998 | Oct 1, 1998 | Oct 14, 1998 |
| № 8340 | N19 | E40 | 11 | 0490 | BETA | Sep 25, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8339 | S16 | E03 | 07 | 0050 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8338 | N31 | E33 | 01 | 0050 | ALPHA | Sep 24, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8337 | S40 | W09 | 04 | 0020 | BETA | Sep 21, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8336 | S29 | W00 | 15 | 0070 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8335 | S21 | W37 | 03 | 0070 | BETA | Sep 19, 1998 | Sep 26, 1998 | Oct 10, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
