Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 335 | S21 | E20 | 15 | 0020 | Beta | Apr 20, 2003 | Apr 26, 2003 | May 10, 2003 |
| № 334 | S10 | W12 | 05 | 0060 | Beta | 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.
