Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 18, 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 | E24 | 08 | 0060 | Beta | Apr 21, 2002 | Apr 28, 2002 | May 11, 2002 |
| № 9909 | N08 | E30 | 03 | 0100 | Beta | Apr 21, 2002 | Apr 28, 2002 | May 11, 2002 |
| № 9907 | S03 | W05 | 25 | 0100 | Beta | Apr 18, 2002 | Apr 25, 2002 | May 9, 2002 |
| № 9906 | S14 | W39 | 26 | 0650 | Beta-Gamma-Delta | Apr 16, 2002 | Apr 23, 2002 | May 6, 2002 |
| № 9902 | N12 | W53 | 03 | 0050 | Beta | Apr 15, 2002 | Apr 22, 2002 | May 5, 2002 |
| № 9899 | N19 | W69 | 01 | 0100 | Alpha | Apr 14, 2002 | Apr 20, 2002 | May 4, 2002 |
| № 9896 | S10 | W83 | 01 | 0040 | Alpha | Apr 13, 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.
