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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8475 | N32 | E43 | 05 | 0010 | BETA | Mar 4, 1999 | Mar 12, 1999 | Mar 26, 1999 |
| № 8474 | S24 | W38 | 02 | 0010 | BETA | Feb 26, 1999 | Mar 5, 1999 | Mar 19, 1999 |
| № 8473 | N18 | W04 | 02 | 0000 | BETA | Mar 1, 1999 | Mar 8, 1999 | Mar 21, 1999 |
| № 8472 | N30 | E27 | 09 | 0010 | BETA | Mar 3, 1999 | Mar 10, 1999 | Mar 24, 1999 |
| № 8471 | N29 | E01 | 14 | 0080 | BETA | Mar 1, 1999 | Mar 8, 1999 | Mar 22, 1999 |
| № 8470 | S23 | E04 | 01 | 0030 | ALPHA | Mar 1, 1999 | Mar 8, 1999 | Mar 22, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to February 1999. The gray background is the average SSN index.
