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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 20, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8737 | S15 | E16 | 08 | 0050 | BETA | Oct 22, 1999 | Oct 29, 1999 | Nov 12, 1999 |
| № 8736 | S21 | E09 | 02 | 0000 | BETA | Oct 22, 1999 | Oct 28, 1999 | Nov 11, 1999 |
| № 8735 | N19 | W04 | 04 | 0020 | BETA | Oct 21, 1999 | Oct 27, 1999 | Nov 10, 1999 |
| № 8732 | N21 | W51 | 29 | 0190 | BETA-GAMMA | Oct 17, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8731 | N13 | W42 | 63 | 0640 | BETA-GAMMA | Oct 18, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8728 | N24 | W68 | 03 | 0130 | 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.
