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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8468 | N35 | W64 | 08 | 0050 | BETA | Feb 17, 1999 | Feb 24, 1999 | Mar 10, 1999 |
| № 8467 | N16 | E18 | 05 | 0100 | ALPHA | Feb 23, 1999 | Mar 2, 1999 | Mar 16, 1999 |
| № 8466 | S22 | E07 | 02 | 0000 | BETA | Feb 22, 1999 | Mar 1, 1999 | Mar 15, 1999 |
| № 8464 | N18 | W38 | 03 | 0030 | BETA | Feb 19, 1999 | Feb 26, 1999 | Mar 12, 1999 |
| № 8463 | S17 | W44 | 01 | 0040 | ALPHA | Feb 19, 1999 | Feb 25, 1999 | Mar 11, 1999 |
| № 8462 | N21 | W63 | 05 | 0130 | BETA | Feb 17, 1999 | Feb 24, 1999 | Mar 10, 1999 |
| № 8458 | S22 | W72 | 09 | 0560 | BETA | Feb 16, 1999 | Feb 23, 1999 | Mar 9, 1999 |
| № 8457 | N15 | W80 | 05 | 0110 | BETA | Feb 16, 1999 | Feb 23, 1999 | Mar 8, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to February 1999. The gray background is the average SSN index.
