No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8548 | S21 | E46 | 01 | 0010 | ALPHA | May 23, 1999 | May 30, 1999 | Jun 12, 1999 |
| № 8547 | N22 | W44 | 02 | 0010 | BETA | May 16, 1999 | May 23, 1999 | Jun 6, 1999 |
| № 8546 | S32 | W75 | 03 | 0050 | BETA | May 13, 1999 | May 20, 1999 | Jun 4, 1999 |
| № 8545 | N36 | E36 | 03 | 0290 | ALPHA | May 22, 1999 | May 29, 1999 | Jun 13, 1999 |
| № 8544 | S20 | E18 | 16 | 0180 | BETA | May 21, 1999 | May 27, 1999 | Jun 10, 1999 |
| № 8543 | N06 | W13 | 02 | 0000 | BETA | May 18, 1999 | May 25, 1999 | Jun 7, 1999 |
| № 8542 | S19 | W08 | 01 | 0040 | ALPHA | May 19, 1999 | May 25, 1999 | Jun 8, 1999 |
| № 8541 | N21 | W55 | 15 | 0230 | BETA | May 15, 1999 | May 22, 1999 | Jun 5, 1999 |
| № 8535 | N22 | W78 | 02 | 0320 | ALPHA | May 13, 1999 | May 20, 1999 | Jun 3, 1999 |
| № 8534 | S22 | W87 | 03 | 0060 | 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.
