Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 339 | N18 | W49 | 06 | 0020 | Beta-Gamma | Apr 19, 2003 | Apr 25, 2003 | May 9, 2003 |
| № 338 | N18 | E05 | 08 | 0040 | Beta | Apr 23, 2003 | Apr 30, 2003 | May 13, 2003 |
| № 337 | S14 | E51 | 10 | 0340 | Beta | Apr 26, 2003 | May 3, 2003 | May 17, 2003 |
| № 336 | N13 | E33 | 02 | 0150 | Alpha | Apr 25, 2003 | May 2, 2003 | May 15, 2003 |
| № 335 | S23 | W37 | 06 | 0020 | Beta | Apr 19, 2003 | Apr 26, 2003 | May 10, 2003 |
| № 334 | S07 | W69 | 01 | 0030 | Alpha | Apr 17, 2003 | Apr 24, 2003 | May 7, 2003 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1974 to April 2003. The gray background is the average SSN index.
