Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 21, 2000. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8970 | S14 | E77 | 02 | 0350 | ALPHA | Apr 28, 2000 | May 5, 2000 | May 18, 2000 |
| № 8969 | N13 | E62 | 01 | 0080 | ALPHA | Apr 27, 2000 | May 4, 2000 | May 17, 2000 |
| № 8968 | S13 | E14 | 11 | 0090 | BETA | Apr 23, 2000 | Apr 30, 2000 | May 13, 2000 |
| № 8967 | N21 | E49 | 06 | 0200 | BETA | Apr 26, 2000 | May 3, 2000 | May 16, 2000 |
| № 8966 | S13 | E38 | 02 | 0040 | ALPHA | Apr 25, 2000 | May 2, 2000 | May 15, 2000 |
| № 8965 | S17 | E26 | 03 | 0010 | BETA | Apr 24, 2000 | May 1, 2000 | May 15, 2000 |
| № 8964 | N34 | W31 | 02 | 0010 | ALPHA | Apr 20, 2000 | Apr 27, 2000 | May 11, 2000 |
| № 8963 | N16 | W18 | 11 | 0060 | BETA | Apr 21, 2000 | Apr 27, 2000 | May 11, 2000 |
| № 8962 | N23 | W15 | 01 | 0030 | ALPHA | Apr 21, 2000 | Apr 28, 2000 | May 12, 2000 |
| № 8959 | S16 | W78 | 02 | 0010 | ALPHA | Apr 16, 2000 | Apr 23, 2000 | May 7, 2000 |
| № 8958 | N19 | W53 | 08 | 0060 | BETA | Apr 18, 2000 | Apr 25, 2000 | May 9, 2000 |
| № 8955 | S21 | W46 | 10 | 0170 | BETA | Apr 18, 2000 | Apr 25, 2000 | May 9, 2000 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1971 to April 2000. The gray background is the average SSN index.
