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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8191 | S20 | E52 | 05 | 0030 | BETA | Apr 6, 1998 | Apr 13, 1998 | Apr 27, 1998 |
| № 8190 | S22 | E36 | 09 | 0100 | BETA | Apr 5, 1998 | Apr 12, 1998 | Apr 26, 1998 |
| № 8189 | S27 | W73 | 01 | 0000 | ALPHA | Mar 27, 1998 | Apr 3, 1998 | Apr 17, 1998 |
| № 8185 | S25 | W51 | 16 | 0480 | BETA-GAMMA | Mar 29, 1998 | Apr 5, 1998 | Apr 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.
