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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 8, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8540 | S28 | E70 | 03 | 0060 | BETA | May 14, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8539 | N13 | E45 | 06 | 0030 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8538 | N10 | W33 | 06 | 0020 | BETA | May 7, 1999 | May 13, 1999 | May 27, 1999 |
| № 8537 | N19 | W60 | 09 | 0040 | BETA | May 4, 1999 | May 11, 1999 | May 25, 1999 |
| № 8536 | S24 | E38 | 05 | 0030 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8535 | N21 | E54 | 03 | 0260 | BETA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S18 | E47 | 01 | 0040 | ALPHA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8533 | N03 | E46 | 05 | 0030 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8531 | N18 | E24 | 03 | 0010 | BETA | May 11, 1999 | May 18, 1999 | May 31, 1999 |
| № 8526 | N19 | W70 | 05 | 0050 | BETA | May 4, 1999 | May 11, 1999 | May 24, 1999 |
| № 8525 | N16 | W31 | 06 | 0120 | BETA | May 7, 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.
