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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8487 | N17 | E53 | 08 | 0090 | BETA | Mar 18, 1999 | Mar 25, 1999 | Apr 7, 1999 |
| № 8485 | N23 | E15 | 25 | 0310 | BETA-GAMMA | Mar 15, 1999 | Mar 22, 1999 | Apr 5, 1999 |
| № 8484 | S22 | E32 | 08 | 0090 | BETA | Mar 16, 1999 | Mar 23, 1999 | Apr 6, 1999 |
| № 8483 | S21 | W83 | 05 | 0060 | BETA | Mar 7, 1999 | Mar 14, 1999 | Mar 28, 1999 |
| № 8477 | S30 | W66 | 02 | 0180 | ALPHA | Mar 9, 1999 | Mar 16, 1999 | Mar 30, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to March 1999. The gray background is the average SSN index.
