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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 578 | N15 | E49 | 16 | 0160 | Beta | Mar 26, 2004 | Apr 1, 2004 | Apr 15, 2004 |
| № 577 | S01 | E41 | 01 | 0070 | Alpha | Mar 25, 2004 | Apr 1, 2004 | Apr 14, 2004 |
| № 576 | S07 | W76 | 03 | 0030 | Beta | Mar 16, 2004 | Mar 23, 2004 | Apr 5, 2004 |
| № 574 | S04 | E16 | 22 | 0120 | Beta-Gamma | Mar 23, 2004 | Mar 30, 2004 | Apr 12, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to March 2004. The gray background is the average SSN index.
