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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8529 | S14 | W01 | 06 | 0010 | BETA | May 5, 1999 | May 12, 1999 | May 25, 1999 |
| № 8528 | S13 | E38 | 01 | 0000 | ALPHA | May 8, 1999 | May 15, 1999 | May 28, 1999 |
| № 8527 | N28 | E27 | 01 | 0010 | ALPHA | May 7, 1999 | May 14, 1999 | May 28, 1999 |
| № 8526 | N23 | W14 | 04 | 0010 | BETA | May 4, 1999 | May 11, 1999 | May 25, 1999 |
| № 8525 | N18 | E26 | 16 | 0260 | BETA | May 7, 1999 | May 14, 1999 | May 27, 1999 |
| № 8524 | N20 | W67 | 07 | 0080 | BETA | Apr 30, 1999 | May 7, 1999 | May 20, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
