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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8224 | S31 | W12 | 01 | 0010 | ALPHA | May 21, 1998 | May 28, 1998 | Jun 12, 1998 |
| № 8223 | S16 | W70 | 01 | 0000 | ALPHA | May 17, 1998 | May 24, 1998 | Jun 6, 1998 |
| № 8222 | N24 | W43 | 11 | 0090 | BETA | May 19, 1998 | May 26, 1998 | Jun 9, 1998 |
| № 8220 | S26 | W49 | 05 | 0020 | BETA | May 18, 1998 | May 25, 1998 | Jun 8, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to May 1998. The gray background is the average SSN index.
