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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 12, 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 | E23 | 23 | 0170 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8540 | S26 | E17 | 13 | 0050 | BETA | May 14, 1999 | May 21, 1999 | Jun 4, 1999 |
| № 8539 | N13 | W14 | 02 | 0010 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8538 | N10 | W90 | 04 | 0040 | BETA | May 6, 1999 | May 13, 1999 | May 27, 1999 |
| № 8536 | S24 | W16 | 19 | 0090 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8535 | N21 | E04 | 10 | 0320 | BETA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S18 | W08 | 11 | 0050 | BETA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8533 | N03 | W07 | 06 | 0020 | BETA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8530 | N12 | W65 | 02 | 0010 | ALPHA | May 8, 1999 | May 15, 1999 | May 29, 1999 |
| № 8525 | N15 | W92 | 01 | 0090 | 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.
