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) | |
|---|---|---|---|---|---|---|---|---|
| № 8801 | S22 | W13 | 04 | 0010 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8800 | N09 | E47 | 01 | 0000 | ALPHA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8799 | S09 | E47 | 07 | 0050 | BETA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8798 | S14 | E48 | 14 | 0280 | BETA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S33 | W16 | 10 | 0090 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8796 | S26 | W32 | 01 | 0000 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 4, 2000 |
| № 8794 | S14 | W20 | 06 | 0020 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8793 | S16 | W70 | 01 | 0000 | ALPHA | Dec 12, 1999 | Dec 19, 1999 | Jan 1, 2000 |
| № 8792 | N20 | W24 | 03 | 0010 | BETA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8788 | N14 | W86 | 01 | 0080 | ALPHA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1970, January to 1999, December. Gray background - average solar cycle.
