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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 16, 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 | N22 | W13 | 07 | 0020 | BETA | May 16, 1999 | May 23, 1999 | Jun 6, 1999 |
| № 8546 | S33 | W43 | 02 | 0000 | BETA | May 13, 1999 | May 21, 1999 | Jun 4, 1999 |
| № 8545 | N36 | E64 | 01 | 0230 | ALPHA | May 22, 1999 | May 29, 1999 | Jun 13, 1999 |
| № 8544 | S21 | E50 | 12 | 0090 | BETA | May 21, 1999 | May 28, 1999 | Jun 10, 1999 |
| № 8543 | N06 | E18 | 02 | 0000 | ALPHA | May 18, 1999 | May 25, 1999 | Jun 8, 1999 |
| № 8542 | S19 | E20 | 01 | 0040 | ALPHA | May 18, 1999 | May 25, 1999 | Jun 8, 1999 |
| № 8541 | N21 | W24 | 27 | 0100 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8540 | S25 | W31 | 02 | 0000 | BETA | May 14, 1999 | May 21, 1999 | Jun 4, 1999 |
| № 8535 | N22 | W47 | 07 | 0370 | BETA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S17 | W58 | 06 | 0090 | BETA | 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.
