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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 16, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8203 | N31 | W26 | 09 | 0100 | BETA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8202 | S24 | W23 | 09 | 0040 | BETA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8200 | S21 | W73 | 03 | 0040 | BETA | Apr 12, 1998 | Apr 18, 1998 | May 2, 1998 |
| № 8198 | S29 | W33 | 04 | 0010 | BETA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8194 | S17 | W58 | 04 | 0190 | BETA | Apr 13, 1998 | Apr 20, 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.
