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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 24, 1999. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8742 | N06 | E82 | 01 | 0250 | ALPHA | Oct 31, 1999 | Nov 7, 1999 | Nov 20, 1999 |
| № 8741 | S25 | E50 | 17 | 0210 | BETA | Oct 29, 1999 | Nov 5, 1999 | Nov 19, 1999 |
| № 8739 | S12 | E30 | 23 | 0440 | BETA | Oct 27, 1999 | Nov 3, 1999 | Nov 17, 1999 |
| № 8738 | N17 | W13 | 06 | 0020 | BETA | Oct 24, 1999 | Oct 31, 1999 | Nov 14, 1999 |
| № 8737 | S14 | W40 | 17 | 0270 | BETA | Oct 22, 1999 | Oct 29, 1999 | Nov 11, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
