No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8807 | N10 | E16 | 06 | 0030 | BETA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8806 | N19 | E12 | 37 | 1050 | BETA-GAMMA | Dec 25, 1999 | Jan 1, 2000 | Jan 15, 2000 |
| № 8804 | S18 | E02 | 01 | 0240 | ALPHA | Dec 24, 1999 | Dec 31, 1999 | Jan 14, 2000 |
| № 8803 | S14 | W57 | 06 | 0050 | BETA | Dec 20, 1999 | Dec 27, 1999 | Jan 9, 2000 |
| № 8798 | S13 | W47 | 30 | 0350 | BETA-GAMMA-DELTA | Dec 20, 1999 | Dec 27, 1999 | Jan 10, 2000 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to December 1999. The gray background is the average SSN index.
