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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 6, 1999. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8509 | N11 | E53 | 01 | 0010 | BETA | Apr 11, 1999 | Apr 18, 1999 | May 1, 1999 |
| № 8508 | N21 | E51 | 15 | 0160 | BETA-GAMMA | Apr 11, 1999 | Apr 18, 1999 | May 1, 1999 |
| № 8507 | N12 | E34 | 11 | 0050 | BETA | Apr 9, 1999 | Apr 16, 1999 | Apr 30, 1999 |
| № 8506 | S26 | W26 | 23 | 0290 | BETA-GAMMA-DELTA | Apr 5, 1999 | Apr 12, 1999 | Apr 26, 1999 |
| № 8504 | S28 | W13 | 11 | 0050 | BETA | Apr 6, 1999 | Apr 13, 1999 | Apr 27, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
