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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8739 | S14 | E71 | 03 | 0050 | BETA | Oct 27, 1999 | Nov 3, 1999 | Nov 17, 1999 |
| № 8738 | N16 | E28 | 02 | 0010 | ALPHA | Oct 24, 1999 | Oct 31, 1999 | Nov 14, 1999 |
| № 8737 | S16 | E01 | 17 | 0070 | BETA | Oct 22, 1999 | Oct 29, 1999 | Nov 12, 1999 |
| № 8736 | S25 | W06 | 02 | 0010 | ALPHA | Oct 22, 1999 | Oct 29, 1999 | Nov 11, 1999 |
| № 8735 | N18 | W19 | 03 | 0010 | BETA | Oct 21, 1999 | Oct 27, 1999 | Nov 10, 1999 |
| № 8734 | N20 | W46 | 05 | 0010 | BETA | Oct 18, 1999 | Oct 25, 1999 | Nov 8, 1999 |
| № 8732 | N22 | W64 | 23 | 0170 | BETA | Oct 17, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8731 | N14 | W55 | 45 | 0440 | BETA-GAMMA | Oct 18, 1999 | Oct 25, 1999 | Nov 7, 1999 |
| № 8728 | N24 | W83 | 03 | 0110 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 5, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
