Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 18, 2003. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 336 | N12 | E75 | 01 | 0100 | Alpha | Apr 25, 2003 | May 1, 2003 | May 15, 2003 |
| № 335 | S22 | E06 | 02 | 0010 | Beta | Apr 19, 2003 | Apr 26, 2003 | May 10, 2003 |
| № 334 | S08 | W24 | 04 | 0060 | Beta | Apr 17, 2003 | Apr 24, 2003 | May 8, 2003 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1974 to April 2003. The gray background is the average SSN index.
