Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on May 20, 2004. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 617 | S10 | W17 | 10 | 0050 | Beta | May 20, 2004 | May 26, 2004 | Jun 9, 2004 |
| № 615 | N16 | E28 | 02 | 0090 | Alpha | May 23, 2004 | May 30, 2004 | Jun 12, 2004 |
| № 613 | S09 | E01 | 01 | 0090 | Alpha | May 21, 2004 | May 28, 2004 | Jun 10, 2004 |
| № 612 | N11 | W68 | 03 | 0050 | Beta | May 16, 2004 | May 23, 2004 | Jun 5, 2004 |
| № 609 | S04 | W56 | 10 | 0200 | Beta | May 17, 2004 | May 23, 2004 | Jun 6, 2004 |
| № 606 | S09 | W78 | 01 | 0050 | Alpha | May 15, 2004 | May 22, 2004 | Jun 4, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to May 2004. The gray background is the average SSN index.
