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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 1, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8505 | N10 | W55 | 02 | 0000 | BETA | Mar 29, 1999 | Apr 5, 1999 | Apr 18, 1999 |
| № 8504 | S28 | E48 | 04 | 0090 | BETA | Apr 6, 1999 | Apr 13, 1999 | Apr 27, 1999 |
| № 8502 | S27 | E31 | 01 | 0010 | ALPHA | Apr 4, 1999 | Apr 11, 1999 | Apr 25, 1999 |
| № 8501 | N25 | E17 | 01 | 0010 | ALPHA | Apr 3, 1999 | Apr 10, 1999 | Apr 24, 1999 |
| № 8498 | N19 | W35 | 01 | 0020 | ALPHA | Mar 30, 1999 | Apr 6, 1999 | Apr 20, 1999 |
| № 8497 | N29 | W49 | 01 | 0050 | ALPHA | Mar 29, 1999 | Apr 5, 1999 | Apr 19, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
