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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 25, 1998. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8209 | S24 | W14 | 01 | 0000 | ALPHA | Apr 25, 1998 | May 2, 1998 | May 16, 1998 |
| № 8208 | N18 | E32 | 01 | 0000 | ALPHA | Apr 28, 1998 | May 5, 1998 | May 19, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to April 1998. The gray background is the average SSN index.
