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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 9, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8199 | S27 | W18 | 10 | 0110 | BETA | Apr 9, 1998 | Apr 16, 1998 | Apr 30, 1998 |
| № 8198 | S28 | E58 | 10 | 0170 | BETA-GAMMA | Apr 15, 1998 | Apr 22, 1998 | May 6, 1998 |
| № 8197 | N32 | E32 | 01 | 0010 | ALPHA | Apr 13, 1998 | Apr 20, 1998 | May 4, 1998 |
| № 8196 | N18 | W74 | 01 | 0010 | ALPHA | Apr 5, 1998 | Apr 11, 1998 | Apr 25, 1998 |
| № 8195 | S27 | E36 | 03 | 0060 | ALPHA | Apr 13, 1998 | Apr 20, 1998 | May 4, 1998 |
| № 8194 | S19 | E34 | 07 | 0280 | BETA | Apr 13, 1998 | Apr 20, 1998 | May 3, 1998 |
| № 8193 | S23 | W14 | 18 | 0260 | BETA | Apr 9, 1998 | Apr 16, 1998 | Apr 30, 1998 |
| № 8190 | S21 | W74 | 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.
