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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 20, 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 | N42 | E66 | 02 | 0010 | BETA | Sep 26, 1998 | Oct 4, 1998 | Oct 19, 1998 |
| № 8342 | N17 | E40 | 01 | 0010 | ALPHA | Sep 24, 1998 | Oct 1, 1998 | Oct 14, 1998 |
| № 8341 | N19 | W56 | 02 | 0020 | BETA | Sep 17, 1998 | Sep 23, 1998 | Oct 7, 1998 |
| № 8340 | N19 | E52 | 12 | 0470 | BETA | Sep 25, 1998 | Oct 2, 1998 | Oct 15, 1998 |
| № 8339 | S17 | E18 | 07 | 0050 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8338 | N31 | E45 | 01 | 0070 | ALPHA | Sep 24, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8337 | S39 | E04 | 04 | 0030 | BETA | Sep 21, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8336 | S30 | E13 | 10 | 0080 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8335 | S21 | W24 | 04 | 0060 | 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.
