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) | |
|---|---|---|---|---|---|---|---|---|
| № 8807 | N11 | E68 | 04 | 0030 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8806 | N19 | E62 | 13 | 0630 | BETA-GAMMA | Dec 25, 1999 | Jan 1, 2000 | Jan 14, 2000 |
| № 8805 | N18 | W41 | 01 | 0000 | ALPHA | Dec 17, 1999 | Dec 24, 1999 | Jan 6, 2000 |
| № 8804 | S19 | E54 | 03 | 0210 | BETA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S13 | W02 | 19 | 0100 | BETA-GAMMA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8800 | N10 | E04 | 01 | 0000 | ALPHA | Dec 20, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8798 | S13 | E07 | 55 | 0490 | BETA-GAMMA-DELTA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S32 | W57 | 02 | 0010 | ALPHA | Dec 15, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8794 | S16 | W53 | 02 | 0000 | ALPHA | 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.
