Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 17, 2002. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9910 | S20 | E35 | 04 | 0030 | Beta | Apr 21, 2002 | Apr 28, 2002 | May 11, 2002 |
| № 9909 | N11 | E40 | 02 | 0120 | Alpha | Apr 21, 2002 | Apr 28, 2002 | May 12, 2002 |
| № 9907 | S03 | E05 | 23 | 0170 | Beta | Apr 19, 2002 | Apr 25, 2002 | May 9, 2002 |
| № 9906 | S15 | W30 | 27 | 0590 | Beta-Gamma-Delta | Apr 16, 2002 | Apr 23, 2002 | May 6, 2002 |
| № 9905 | S15 | W85 | 03 | 0050 | Beta | Apr 12, 2002 | Apr 19, 2002 | May 2, 2002 |
| № 9903 | N17 | W27 | 02 | 0010 | Alpha | Apr 16, 2002 | Apr 23, 2002 | May 7, 2002 |
| № 9902 | N12 | W44 | 05 | 0070 | Beta | Apr 15, 2002 | Apr 22, 2002 | May 5, 2002 |
| № 9901 | N21 | W88 | 03 | 0270 | Alpha | Apr 11, 2002 | Apr 18, 2002 | May 2, 2002 |
| № 9899 | N18 | W60 | 02 | 0140 | Beta | Apr 14, 2002 | Apr 20, 2002 | May 4, 2002 |
| № 9896 | S10 | W76 | 01 | 0090 | Alpha | Apr 12, 2002 | Apr 19, 2002 | May 3, 2002 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1973 to April 2002. The gray background is the average SSN index.
