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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8557 | S28 | E75 | 05 | 0090 | BETA | Jun 4, 1999 | Jun 11, 1999 | Jun 25, 1999 |
| № 8556 | S14 | E10 | 04 | 0010 | BETA | May 30, 1999 | Jun 5, 1999 | Jun 19, 1999 |
| № 8555 | N15 | E63 | 01 | 0060 | ALPHA | Jun 3, 1999 | Jun 9, 1999 | Jun 23, 1999 |
| № 8554 | N26 | E13 | 11 | 0060 | BETA | May 30, 1999 | Jun 6, 1999 | Jun 20, 1999 |
| № 8552 | N20 | E27 | 16 | 0360 | BETA-GAMMA | May 31, 1999 | Jun 7, 1999 | Jun 21, 1999 |
| № 8551 | N32 | W12 | 06 | 0050 | BETA | May 28, 1999 | Jun 4, 1999 | Jun 18, 1999 |
| № 8550 | S15 | W28 | 10 | 0050 | BETA | May 27, 1999 | Jun 3, 1999 | Jun 16, 1999 |
| № 8548 | S21 | W81 | 07 | 0060 | BETA | May 23, 1999 | May 30, 1999 | Jun 12, 1999 |
| № 8545 | N37 | W83 | 04 | 0130 | BETA | May 22, 1999 | May 29, 1999 | Jun 13, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to May 1999. The gray background is the average SSN index.
