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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 10, 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 | E55 | 20 | 0190 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8540 | S28 | E48 | 09 | 0080 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8539 | N14 | E18 | 04 | 0020 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8538 | N11 | W60 | 07 | 0020 | BETA | May 6, 1999 | May 13, 1999 | May 27, 1999 |
| № 8537 | N20 | W86 | 04 | 0170 | BETA | May 4, 1999 | May 11, 1999 | May 25, 1999 |
| № 8536 | S24 | E14 | 19 | 0080 | BETA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8535 | N21 | E32 | 07 | 0330 | BETA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S18 | E23 | 04 | 0040 | BETA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8533 | N04 | E22 | 04 | 0010 | BETA | May 13, 1999 | May 19, 1999 | Jun 2, 1999 |
| № 8531 | N20 | W03 | 03 | 0010 | BETA | May 11, 1999 | May 18, 1999 | May 31, 1999 |
| № 8525 | N17 | W58 | 01 | 0140 | 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.
