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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8206 | N25 | E30 | 01 | 0000 | ALPHA | Apr 24, 1998 | May 1, 1998 | May 15, 1998 |
| № 8205 | N21 | W39 | 14 | 0100 | BETA | Apr 19, 1998 | Apr 26, 1998 | May 10, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to April 1998. The gray background is the average SSN index.
