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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8445 | N12 | E10 | 02 | 0000 | BETA | Jan 23, 1999 | Jan 30, 1999 | Feb 12, 1999 |
| № 8444 | N19 | E05 | 02 | 0000 | ALPHA | Jan 22, 1999 | Jan 29, 1999 | Feb 12, 1999 |
| № 8443 | S17 | E45 | 01 | 0000 | ALPHA | Jan 25, 1999 | Feb 1, 1999 | Feb 15, 1999 |
| № 8442 | N24 | W55 | 07 | 0100 | BETA | Jan 18, 1999 | Jan 25, 1999 | Feb 8, 1999 |
| № 8440 | N19 | W24 | 39 | 0300 | BETA-GAMMA | Jan 20, 1999 | Jan 27, 1999 | Feb 10, 1999 |
| № 8439 | S24 | W28 | 34 | 0290 | BETA-GAMMA | Jan 20, 1999 | Jan 27, 1999 | Feb 10, 1999 |
| № 8437 | N11 | W64 | 01 | 0070 | 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.
