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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8441 | N17 | E02 | 03 | 0010 | BETA | Jan 18, 1999 | Jan 25, 1999 | Feb 8, 1999 |
| № 8440 | N19 | E31 | 31 | 0360 | BETA-GAMMA | Jan 20, 1999 | Jan 27, 1999 | Feb 10, 1999 |
| № 8439 | S24 | E30 | 31 | 0270 | BETA | Jan 20, 1999 | Jan 27, 1999 | Feb 10, 1999 |
| № 8437 | N10 | W09 | 01 | 0080 | ALPHA | Jan 17, 1999 | Jan 24, 1999 | Feb 7, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to January 1999. The gray background is the average SSN index.
