No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 15, 1999. Coordinates are given as of the end of the day.
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 8801 | S23 | W04 | 02 | 0000 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8800 | N11 | E57 | 01 | 0020 | ALPHA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8799 | S09 | E57 | 02 | 0080 | BETA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8798 | S13 | E57 | 05 | 0100 | BETA | Dec 21, 1999 | Dec 27, 1999 | Jan 10, 2000 |
| № 8797 | S34 | W05 | 07 | 0080 | BETA | Dec 16, 1999 | Dec 23, 1999 | Jan 6, 2000 |
| № 8796 | S27 | W21 | 01 | 0000 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8795 | S14 | W50 | 03 | 0030 | BETA | Dec 12, 1999 | Dec 19, 1999 | Jan 2, 2000 |
| № 8794 | S13 | W11 | 01 | 0010 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8792 | N16 | W14 | 01 | 0000 | ALPHA | Dec 15, 1999 | Dec 22, 1999 | Jan 5, 2000 |
| № 8790 | N15 | W72 | 01 | 0000 | ALPHA | Dec 11, 1999 | Dec 18, 1999 | Dec 31, 1999 |
| № 8788 | N11 | W78 | 05 | 0170 | BETA | Dec 10, 1999 | Dec 17, 1999 | Dec 31, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
