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) | |
|---|---|---|---|---|---|---|---|---|
| № 8789 | N29 | W10 | 03 | 0000 | BETA | Dec 3, 1999 | Dec 10, 1999 | Dec 24, 1999 |
| № 8788 | N13 | E78 | 01 | 0180 | ALPHA | Dec 10, 1999 | Dec 17, 1999 | Dec 30, 1999 |
| № 8787 | N14 | E46 | 02 | 0000 | BETA | Dec 7, 1999 | Dec 14, 1999 | Dec 28, 1999 |
| № 8786 | N22 | W07 | 04 | 0010 | BETA | Dec 3, 1999 | Dec 10, 1999 | Dec 24, 1999 |
| № 8785 | N14 | E58 | 02 | 0160 | ALPHA | Dec 8, 1999 | Dec 15, 1999 | Dec 29, 1999 |
| № 8784 | N30 | E05 | 04 | 0030 | BETA | Dec 4, 1999 | Dec 11, 1999 | Dec 26, 1999 |
| № 8783 | S16 | W72 | 01 | 0010 | ALPHA | Nov 29, 1999 | Dec 5, 1999 | Dec 19, 1999 |
| № 8782 | N11 | W68 | 14 | 0400 | BETA | Nov 29, 1999 | Dec 6, 1999 | Dec 19, 1999 |
| № 8781 | S12 | W29 | 20 | 0280 | BETA | Dec 2, 1999 | Dec 9, 1999 | Dec 22, 1999 |
| № 8778 | S12 | W91 | 05 | 0180 | 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.
