Active areas
Sunspots and active regions
By the end of the day, the following active regions with sunspots could be observed on the Sun's surface
| Group ID | Location | Number of sunspots | Area (msh) | Type | CM Passage | Disappearance (W90) | Reappearance (W270) | |
|---|---|---|---|---|---|---|---|---|
| № 8195 | S26 | E77 | 01 | 0030 | ALPHA | Apr 13, 1998 | Apr 20, 1998 | May 4, 1998 |
| № 8194 | S18 | E73 | 03 | 0150 | BETA | Apr 12, 1998 | Apr 19, 1998 | May 3, 1998 |
| № 8193 | S22 | E30 | 16 | 0250 | BETA | Apr 9, 1998 | Apr 16, 1998 | Apr 30, 1998 |
| № 8191 | S21 | W17 | 04 | 0010 | BETA | Apr 6, 1998 | Apr 12, 1998 | Apr 26, 1998 |
| № 8190 | S20 | W28 | 08 | 0060 | BETA | Apr 5, 1998 | Apr 12, 1998 | Apr 25, 1998 |
Solar cycle progression
Average monthly sunspot number (SSN) from 1969, January to 1998, April. Gray background - average solar cycle.
