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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 16, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8488 | S26 | E20 | 03 | 0000 | BETA | Mar 19, 1999 | Mar 26, 1999 | Apr 9, 1999 |
| № 8487 | N16 | E09 | 18 | 0200 | BETA | Mar 18, 1999 | Mar 25, 1999 | Apr 7, 1999 |
| № 8485 | N23 | W27 | 58 | 0560 | GAMMA | Mar 15, 1999 | Mar 22, 1999 | Apr 5, 1999 |
| № 8484 | S23 | W10 | 07 | 0040 | BETA | Mar 16, 1999 | Mar 23, 1999 | Apr 6, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to March 1999. The gray background is the average SSN index.
