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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8449 | N27 | W77 | 03 | 0010 | BETA | Jan 26, 1999 | Feb 2, 1999 | Feb 16, 1999 |
| № 8446 | N17 | W62 | 06 | 0160 | BETA | Jan 28, 1999 | Feb 3, 1999 | Feb 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.
