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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8550 | S14 | E67 | 04 | 0120 | BETA | May 27, 1999 | Jun 3, 1999 | Jun 17, 1999 |
| № 8549 | N24 | W66 | 07 | 0120 | BETA | May 17, 1999 | May 24, 1999 | Jun 7, 1999 |
| № 8548 | S20 | E05 | 16 | 0050 | BETA | May 23, 1999 | May 30, 1999 | Jun 12, 1999 |
| № 8545 | N36 | W02 | 05 | 0320 | BETA | May 22, 1999 | May 29, 1999 | Jun 13, 1999 |
| № 8544 | S20 | W23 | 28 | 0140 | BETA | May 20, 1999 | May 27, 1999 | Jun 10, 1999 |
| № 8542 | S18 | W48 | 01 | 0030 | ALPHA | May 19, 1999 | May 25, 1999 | Jun 8, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
