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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8514 | S33 | E06 | 10 | 0030 | BETA | Apr 15, 1999 | Apr 22, 1999 | May 6, 1999 |
| № 8513 | S18 | E07 | 18 | 0060 | BETA | Apr 15, 1999 | Apr 22, 1999 | May 5, 1999 |
| № 8512 | S28 | W04 | 05 | 0030 | BETA | Apr 14, 1999 | Apr 21, 1999 | May 5, 1999 |
| № 8511 | S16 | W21 | 05 | 0080 | BETA | Apr 13, 1999 | Apr 19, 1999 | May 3, 1999 |
| № 8509 | N14 | W33 | 02 | 0010 | BETA | Apr 12, 1999 | Apr 18, 1999 | May 2, 1999 |
| № 8508 | N22 | W44 | 13 | 0060 | BETA | Apr 11, 1999 | Apr 18, 1999 | May 2, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
