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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 15, 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 | N30 | W16 | 02 | 0010 | ALPHA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8202 | S26 | W11 | 08 | 0030 | BETA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8200 | S23 | W65 | 02 | 0040 | BETA | Apr 11, 1998 | Apr 18, 1998 | May 2, 1998 |
| № 8198 | S29 | W21 | 06 | 0010 | BETA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8195 | S27 | W37 | 02 | 0010 | ALPHA | Apr 13, 1998 | Apr 20, 1998 | May 4, 1998 |
| № 8194 | S19 | W46 | 03 | 0180 | 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.
