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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8439 | S24 | E71 | 05 | 0160 | BETA | Jan 20, 1999 | Jan 27, 1999 | Feb 10, 1999 |
| № 8438 | S18 | E03 | 05 | 0020 | BETA | Jan 15, 1999 | Jan 21, 1999 | Feb 4, 1999 |
| № 8437 | N11 | E38 | 01 | 0080 | ALPHA | Jan 17, 1999 | Jan 24, 1999 | Feb 7, 1999 |
| № 8434 | S27 | W21 | 04 | 0010 | BETA | Jan 13, 1999 | Jan 20, 1999 | Feb 3, 1999 |
| № 8431 | S27 | W36 | 01 | 0020 | ALPHA | Jan 12, 1999 | Jan 19, 1999 | Feb 2, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to January 1999. The gray background is the average SSN index.
