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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8192 | S32 | W72 | 03 | 0020 | BETA | Mar 31, 1998 | Apr 7, 1998 | Apr 21, 1998 |
| № 8191 | S20 | E05 | 08 | 0040 | BETA-GAMMA | Apr 6, 1998 | Apr 13, 1998 | Apr 26, 1998 |
| № 8190 | S20 | W07 | 18 | 0140 | BETA | Apr 5, 1998 | Apr 12, 1998 | Apr 25, 1998 |
| № 8185 | S25 | W89 | 05 | 0210 | BETA | 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.
