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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8524 | N22 | E10 | 22 | 0240 | BETA | Apr 30, 1999 | May 7, 1999 | May 21, 1999 |
| № 8523 | N31 | E00 | 12 | 0040 | BETA | Apr 29, 1999 | May 6, 1999 | May 21, 1999 |
| № 8522 | N16 | E10 | 07 | 0070 | BETA | Apr 30, 1999 | May 7, 1999 | May 21, 1999 |
| № 8518 | S13 | W67 | 01 | 0070 | ALPHA | Apr 24, 1999 | May 1, 1999 | May 15, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
