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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8741 | S25 | E66 | 07 | 0080 | BETA | Oct 29, 1999 | Nov 5, 1999 | Nov 19, 1999 |
| № 8740 | N27 | W81 | 02 | 0000 | ALPHA | Oct 18, 1999 | Oct 25, 1999 | Nov 8, 1999 |
| № 8739 | S13 | E45 | 19 | 0220 | BETA | Oct 27, 1999 | Nov 3, 1999 | Nov 17, 1999 |
| № 8738 | N17 | E01 | 03 | 0020 | BETA | Oct 24, 1999 | Oct 31, 1999 | Nov 13, 1999 |
| № 8737 | S15 | W24 | 22 | 0310 | BETA | Oct 22, 1999 | Oct 29, 1999 | Nov 12, 1999 |
| № 8734 | N16 | W70 | 01 | 0000 | ALPHA | Oct 19, 1999 | Oct 25, 1999 | Nov 8, 1999 |
| № 8732 | N20 | W87 | 07 | 0060 | BETA | Oct 17, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8731 | N12 | W77 | 12 | 0160 | BETA | Oct 18, 1999 | Oct 25, 1999 | Nov 7, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
