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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8205 | N21 | W03 | 08 | 0020 | BETA | Apr 19, 1998 | Apr 26, 1998 | May 10, 1998 |
| № 8204 | S16 | W05 | 02 | 0010 | BETA | Apr 19, 1998 | Apr 26, 1998 | May 9, 1998 |
| № 8203 | N31 | W54 | 05 | 0030 | BETA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8202 | S24 | W50 | 04 | 0010 | BETA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8194 | S17 | W90 | 01 | 0060 | ALPHA | Apr 12, 1998 | Apr 19, 1998 | May 3, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to April 1998. The gray background is the average SSN index.
