Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 574 | S02 | E70 | 04 | 0040 | Beta | Mar 23, 2004 | Mar 30, 2004 | Apr 13, 2004 |
| № 573 | S12 | E20 | 04 | 0020 | Beta | Mar 20, 2004 | Mar 26, 2004 | Apr 9, 2004 |
| № 572 | N19 | W58 | 01 | 0040 | Alpha | Mar 14, 2004 | Mar 20, 2004 | Apr 3, 2004 |
| № 570 | S14 | W66 | 04 | 0220 | Beta-Gamma | Mar 13, 2004 | Mar 20, 2004 | Apr 2, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to March 2004. The gray background is the average SSN index.
