Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 9914 | N05 | E61 | 04 | 0040 | Beta | Apr 26, 2002 | May 3, 2002 | May 17, 2002 |
| № 9913 | S16 | E12 | 06 | 0030 | Beta | Apr 23, 2002 | Apr 30, 2002 | May 13, 2002 |
| № 9912 | N10 | E04 | 26 | 0200 | Beta | Apr 22, 2002 | Apr 29, 2002 | May 13, 2002 |
| № 9911 | S13 | W02 | 08 | 0030 | Beta | Apr 22, 2002 | Apr 29, 2002 | May 12, 2002 |
| № 9910 | S20 | W16 | 23 | 0180 | Beta | Apr 21, 2002 | Apr 28, 2002 | May 11, 2002 |
| № 9909 | N07 | W08 | 06 | 0100 | Beta | Apr 21, 2002 | Apr 28, 2002 | May 12, 2002 |
| № 9907 | S03 | W46 | 05 | 0070 | Beta | Apr 18, 2002 | Apr 25, 2002 | May 9, 2002 |
| № 9906 | S14 | W77 | 27 | 0680 | Beta-Gamma | Apr 16, 2002 | Apr 23, 2002 | May 6, 2002 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1973 to April 2002. The gray background is the average SSN index.
