Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 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) | |
|---|---|---|---|---|---|---|---|---|
| № 561 | N02 | E52 | 01 | 0030 | Alpha | Feb 22, 2004 | Feb 29, 2004 | Mar 13, 2004 |
| № 560 | S17 | E17 | 02 | 0010 | Beta | Feb 19, 2004 | Feb 26, 2004 | Mar 11, 2004 |
| № 559 | N07 | W68 | 01 | 0030 | Alpha | Feb 13, 2004 | Feb 20, 2004 | Mar 4, 2004 |
| № 558 | S16 | W06 | 01 | 0000 | Alpha | Feb 18, 2004 | Feb 24, 2004 | Mar 9, 2004 |
| № 556 | N15 | W54 | 03 | 0020 | Beta | Feb 14, 2004 | Feb 21, 2004 | Mar 5, 2004 |
| № 555 | S16 | W22 | 01 | 0000 | Alpha | Feb 16, 2004 | Feb 23, 2004 | Mar 8, 2004 |
| № 554 | S08 | W43 | 02 | 0100 | Beta | 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.
