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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8561 | N25 | E07 | 01 | 0000 | ALPHA | Jun 1, 1999 | Jun 8, 1999 | Jun 22, 1999 |
| № 8560 | S24 | E36 | 07 | 0070 | ALPHA | Jun 4, 1999 | Jun 11, 1999 | Jun 25, 1999 |
| № 8559 | N21 | W07 | 07 | 0330 | BETA | May 31, 1999 | Jun 7, 1999 | Jun 21, 1999 |
| № 8558 | N16 | E44 | 29 | 0300 | BETA | Jun 4, 1999 | Jun 11, 1999 | Jun 25, 1999 |
| № 8557 | S30 | E35 | 05 | 0070 | ALPHA | Jun 4, 1999 | Jun 11, 1999 | Jun 25, 1999 |
| № 8555 | N16 | E23 | 01 | 0050 | ALPHA | Jun 3, 1999 | Jun 10, 1999 | Jun 23, 1999 |
| № 8554 | N24 | W26 | 04 | 0010 | BETA | May 30, 1999 | Jun 6, 1999 | Jun 20, 1999 |
| № 8552 | N19 | W17 | 11 | 0200 | BETA-GAMMA | May 31, 1999 | Jun 7, 1999 | Jun 20, 1999 |
| № 8551 | N30 | W48 | 03 | 0010 | ALPHA | May 28, 1999 | Jun 4, 1999 | Jun 18, 1999 |
| № 8550 | S15 | W71 | 01 | 0010 | ALPHA | May 27, 1999 | Jun 2, 1999 | Jun 16, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
