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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8504 | S28 | E58 | 03 | 0140 | ALPHA | Apr 6, 1999 | Apr 13, 1999 | Apr 27, 1999 |
| № 8503 | S22 | W34 | 01 | 0000 | ALPHA | Mar 30, 1999 | Apr 6, 1999 | Apr 19, 1999 |
| № 8502 | S27 | E42 | 03 | 0030 | BETA | Apr 5, 1999 | Apr 12, 1999 | Apr 26, 1999 |
| № 8501 | N27 | E26 | 02 | 0020 | ALPHA | Apr 3, 1999 | Apr 10, 1999 | Apr 24, 1999 |
| № 8498 | N18 | W25 | 02 | 0030 | BETA | Mar 30, 1999 | Apr 6, 1999 | Apr 20, 1999 |
| № 8497 | N29 | W41 | 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 March 1999. The gray background is the average SSN index.
