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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8430 | S25 | E50 | 02 | 0000 | ALPHA | Jan 9, 1999 | Jan 16, 1999 | Jan 30, 1999 |
| № 8428 | N24 | W26 | 02 | 0010 | BETA | Jan 3, 1999 | Jan 10, 1999 | Jan 24, 1999 |
| № 8426 | N15 | E16 | 12 | 0020 | BETA | Jan 6, 1999 | Jan 13, 1999 | Jan 27, 1999 |
| № 8425 | S29 | W02 | 01 | 0000 | ALPHA | Jan 5, 1999 | Jan 12, 1999 | Jan 26, 1999 |
| № 8422 | S23 | W52 | 04 | 0080 | BETA | Jan 1, 1999 | Jan 8, 1999 | Jan 22, 1999 |
| № 8421 | N26 | W67 | 32 | 0560 | BETA-GAMMA-DELTA | Dec 31, 1998 | Jan 7, 1999 | Jan 21, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to January 1999. The gray background is the average SSN index.
