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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 11, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8541 | N22 | E36 | 24 | 0230 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8540 | S27 | E31 | 10 | 0100 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8539 | N13 | E01 | 02 | 0010 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8538 | N11 | W78 | 04 | 0010 | BETA | May 6, 1999 | May 13, 1999 | May 27, 1999 |
| № 8536 | S24 | W02 | 18 | 0100 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8535 | N21 | E14 | 08 | 0310 | BETA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S18 | E06 | 04 | 0030 | BETA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8533 | N04 | E03 | 02 | 0000 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8527 | N21 | W65 | 01 | 0000 | ALPHA | May 7, 1999 | May 14, 1999 | May 28, 1999 |
| № 8525 | N16 | W76 | 01 | 0110 | ALPHA | May 6, 1999 | May 13, 1999 | May 27, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
