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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 12, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8731 | N10 | E64 | 06 | 0120 | BETA | Oct 18, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8729 | N12 | E46 | 14 | 0030 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 6, 1999 |
| № 8728 | N22 | E40 | 22 | 0560 | BETA-GAMMA | Oct 16, 1999 | Oct 23, 1999 | Nov 6, 1999 |
| № 8727 | N18 | E03 | 04 | 0020 | BETA | Oct 13, 1999 | Oct 20, 1999 | Nov 3, 1999 |
| № 8725 | S24 | W11 | 01 | 0030 | ALPHA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8721 | S16 | W48 | 01 | 0010 | ALPHA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8720 | N13 | W36 | 04 | 0010 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 31, 1999 |
| № 8719 | S21 | W55 | 03 | 0080 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 29, 1999 |
| № 8716 | N23 | W45 | 06 | 0180 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8714 | N14 | W81 | 02 | 0030 | ALPHA | Oct 7, 1999 | Oct 14, 1999 | Oct 27, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
