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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8527 | N27 | E66 | 01 | 0000 | ALPHA | May 7, 1999 | May 14, 1999 | May 28, 1999 |
| № 8525 | N16 | E60 | 10 | 0200 | BETA | May 7, 1999 | May 14, 1999 | May 27, 1999 |
| № 8524 | N21 | W30 | 28 | 0270 | BETA-GAMMA | Apr 30, 1999 | May 7, 1999 | May 21, 1999 |
| № 8523 | N32 | W37 | 01 | 0000 | ALPHA | Apr 29, 1999 | May 6, 1999 | May 21, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
