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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8521 | N34 | W49 | 08 | 0030 | BETA | Apr 20, 1999 | Apr 28, 1999 | May 12, 1999 |
| № 8518 | S15 | E01 | 18 | 0170 | BETA | Apr 24, 1999 | May 1, 1999 | May 15, 1999 |
| № 8516 | S20 | W39 | 06 | 0040 | 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.
