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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 2, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8427 | N16 | W77 | 02 | 0010 | BETA | Dec 28, 1998 | Jan 4, 1999 | Jan 18, 1999 |
| № 8426 | N14 | E37 | 01 | 0010 | ALPHA | Jan 6, 1999 | Jan 13, 1999 | Jan 27, 1999 |
| № 8422 | S24 | W30 | 06 | 0090 | BETA | Jan 1, 1999 | Jan 8, 1999 | Jan 22, 1999 |
| № 8421 | N27 | W41 | 43 | 0660 | BETA-GAMMA-DELTA | Dec 31, 1998 | Jan 7, 1999 | Jan 21, 1999 |
| № 8420 | N20 | W46 | 05 | 0030 | BETA | Dec 31, 1998 | Jan 7, 1999 | Jan 20, 1999 |
| № 8419 | N28 | W99 | 04 | 0060 | BETA | Dec 27, 1998 | Jan 3, 1999 | Jan 17, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to January 1999. The gray background is the average SSN index.
