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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 10, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8459 | S30 | E41 | 02 | 0000 | ALPHA | Feb 14, 1999 | Feb 21, 1999 | Mar 7, 1999 |
| № 8458 | S22 | E67 | 03 | 0390 | ALPHA | Feb 16, 1999 | Feb 23, 1999 | Mar 9, 1999 |
| № 8457 | N18 | E63 | 03 | 0090 | BETA | Feb 16, 1999 | Feb 23, 1999 | Mar 8, 1999 |
| № 8456 | N24 | E44 | 09 | 0140 | BETA | Feb 14, 1999 | Feb 21, 1999 | Mar 7, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to February 1999. The gray background is the average SSN index.
