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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 25, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8524 | N22 | E55 | 01 | 0000 | ALPHA | Apr 30, 1999 | May 7, 1999 | May 21, 1999 |
| № 8523 | N32 | E44 | 03 | 0000 | BETA | Apr 29, 1999 | May 6, 1999 | May 21, 1999 |
| № 8522 | N16 | E52 | 05 | 0010 | BETA | Apr 30, 1999 | May 7, 1999 | May 20, 1999 |
| № 8521 | N33 | W74 | 01 | 0010 | ALPHA | Apr 20, 1999 | Apr 27, 1999 | May 11, 1999 |
| № 8518 | S14 | W21 | 09 | 0120 | BETA | Apr 24, 1999 | May 1, 1999 | May 15, 1999 |
| № 8516 | S19 | W60 | 10 | 0020 | BETA | Apr 21, 1999 | Apr 28, 1999 | May 12, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
