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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8547 | N21 | W28 | 05 | 0020 | BETA | May 16, 1999 | May 23, 1999 | Jun 5, 1999 |
| № 8546 | S34 | W59 | 03 | 0030 | BETA | May 13, 1999 | May 20, 1999 | Jun 4, 1999 |
| № 8545 | N37 | E51 | 02 | 0260 | ALPHA | May 22, 1999 | May 29, 1999 | Jun 13, 1999 |
| № 8544 | S20 | E36 | 15 | 0160 | BETA | May 21, 1999 | May 27, 1999 | Jun 10, 1999 |
| № 8543 | N06 | E05 | 02 | 0000 | BETA | May 18, 1999 | May 25, 1999 | Jun 8, 1999 |
| № 8542 | S19 | E08 | 01 | 0030 | ALPHA | May 18, 1999 | May 25, 1999 | Jun 8, 1999 |
| № 8541 | N20 | W37 | 19 | 0130 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8540 | S31 | W36 | 01 | 0000 | ALPHA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8535 | N22 | W60 | 02 | 0340 | ALPHA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S16 | W75 | 01 | 0050 | ALPHA | May 12, 1999 | May 19, 1999 | Jun 2, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
