Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 561 | N02 | E41 | 01 | 0030 | Alpha | Feb 22, 2004 | Feb 29, 2004 | Mar 13, 2004 |
| № 554 | S08 | W54 | 01 | 0050 | Alpha | Feb 15, 2004 | Feb 22, 2004 | Mar 6, 2004 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1975 to February 2004. The gray background is the average SSN index.
