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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8490 | S20 | E66 | 01 | 0000 | ALPHA | Mar 24, 1999 | Mar 31, 1999 | Apr 14, 1999 |
| № 8489 | N14 | W41 | 01 | 0010 | ALPHA | Mar 16, 1999 | Mar 23, 1999 | Apr 5, 1999 |
| № 8488 | S26 | W04 | 08 | 0040 | BETA | Mar 19, 1999 | Mar 26, 1999 | Apr 9, 1999 |
| № 8487 | N17 | W15 | 21 | 0180 | BETA | Mar 18, 1999 | Mar 25, 1999 | Apr 7, 1999 |
| № 8485 | N24 | W52 | 36 | 0570 | BETA-GAMMA | Mar 15, 1999 | Mar 22, 1999 | Apr 5, 1999 |
| № 8484 | S23 | W34 | 04 | 0020 | 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.
