Active areas
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 8785 | N14 | E71 | 01 | 0060 | ALPHA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
| № 8784 | N30 | E18 | 04 | 0030 | BETA | Dec 4, 1999 | Dec 12, 1999 | Dec 26, 1999 |
| № 8783 | S16 | W58 | 03 | 0030 | BETA | Nov 29, 1999 | Dec 5, 1999 | Dec 19, 1999 |
| № 8782 | N09 | W53 | 17 | 0220 | BETA | Nov 29, 1999 | Dec 6, 1999 | Dec 19, 1999 |
| № 8781 | S12 | W16 | 16 | 0250 | BETA | Dec 2, 1999 | Dec 9, 1999 | Dec 22, 1999 |
| № 8780 | S15 | W39 | 01 | 0000 | ALPHA | Nov 30, 1999 | Dec 7, 1999 | Dec 21, 1999 |
| № 8778 | S15 | W78 | 07 | 0160 | BETA | Nov 27, 1999 | Dec 4, 1999 | Dec 18, 1999 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1970, January to 1999, December. Gray background - average solar cycle.
