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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8542 | S19 | E60 | 01 | 0030 | ALPHA | May 18, 1999 | May 25, 1999 | Jun 8, 1999 |
| № 8541 | N21 | E15 | 22 | 0130 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8540 | S27 | E10 | 12 | 0040 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8536 | S24 | W25 | 09 | 0030 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8535 | N22 | W07 | 11 | 0270 | BETA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S18 | W17 | 14 | 0090 | BETA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8531 | N20 | W43 | 02 | 0000 | ALPHA | May 11, 1999 | May 17, 1999 | May 31, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
