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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 7, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8195 | S27 | E64 | 02 | 0060 | ALPHA | Apr 13, 1998 | Apr 20, 1998 | May 4, 1998 |
| № 8194 | S18 | E62 | 05 | 0260 | BETA | Apr 13, 1998 | Apr 19, 1998 | May 3, 1998 |
| № 8193 | S22 | E16 | 20 | 0280 | BETA | Apr 9, 1998 | Apr 16, 1998 | Apr 30, 1998 |
| № 8191 | S20 | W29 | 04 | 0010 | BETA | Apr 6, 1998 | Apr 13, 1998 | Apr 26, 1998 |
| № 8190 | S20 | W46 | 01 | 0040 | ALPHA | Apr 4, 1998 | Apr 11, 1998 | Apr 25, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to April 1998. The gray background is the average SSN index.
