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) | |
|---|---|---|---|---|---|---|---|---|
| № 8806 | N18 | E71 | 04 | 0320 | BETA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8805 | N18 | W27 | 02 | 0010 | ALPHA | Dec 17, 1999 | Dec 24, 1999 | Jan 7, 2000 |
| № 8804 | S17 | E66 | 01 | 0150 | ALPHA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S13 | E10 | 12 | 0070 | BETA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8800 | N10 | E18 | 01 | 0000 | ALPHA | Dec 20, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8798 | S13 | E21 | 48 | 0550 | BETA-GAMMA-DELTA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S33 | W41 | 10 | 0060 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8796 | S25 | W58 | 01 | 0000 | ALPHA | Dec 15, 1999 | Dec 21, 1999 | Jan 4, 2000 |
| № 8794 | S14 | W40 | 10 | 0020 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 5, 2000 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1970, January to 1999, December. Gray background - average solar cycle.
