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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8551 | N33 | E52 | 03 | 0050 | BETA | May 28, 1999 | Jun 4, 1999 | Jun 18, 1999 |
| № 8550 | S14 | E45 | 14 | 0190 | BETA | May 27, 1999 | Jun 3, 1999 | Jun 17, 1999 |
| № 8549 | N25 | W83 | 01 | 0120 | ALPHA | May 17, 1999 | May 24, 1999 | Jun 7, 1999 |
| № 8548 | S19 | W17 | 16 | 0110 | BETA | May 23, 1999 | May 29, 1999 | Jun 12, 1999 |
| № 8545 | N36 | W22 | 02 | 0360 | ALPHA | May 22, 1999 | May 29, 1999 | Jun 13, 1999 |
| № 8544 | S21 | W45 | 14 | 0190 | BETA | May 20, 1999 | May 27, 1999 | Jun 10, 1999 |
| № 8542 | S20 | W70 | 01 | 0030 | ALPHA | May 18, 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.
