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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 20, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8496 | S11 | W01 | 05 | 0020 | BETA | Mar 21, 1999 | Mar 28, 1999 | Apr 10, 1999 |
| № 8495 | S21 | E64 | 01 | 0000 | ALPHA | Mar 26, 1999 | Apr 2, 1999 | Apr 15, 1999 |
| № 8494 | S22 | E17 | 06 | 0010 | BETA | Mar 22, 1999 | Mar 29, 1999 | Apr 12, 1999 |
| № 8493 | N19 | W20 | 16 | 0040 | BETA | Mar 19, 1999 | Mar 26, 1999 | Apr 9, 1999 |
| № 8492 | S27 | W44 | 02 | 0010 | ALPHA | Mar 17, 1999 | Mar 24, 1999 | Apr 7, 1999 |
| № 8490 | S19 | E42 | 02 | 0010 | ALPHA | Mar 24, 1999 | Mar 31, 1999 | Apr 14, 1999 |
| № 8488 | S27 | W28 | 14 | 0090 | BETA | Mar 19, 1999 | Mar 26, 1999 | Apr 9, 1999 |
| № 8487 | N16 | W43 | 02 | 0160 | ALPHA | Mar 18, 1999 | Mar 24, 1999 | Apr 7, 1999 |
| № 8485 | N22 | W77 | 08 | 0200 | BETA | Mar 15, 1999 | Mar 22, 1999 | Apr 5, 1999 |
| № 8484 | S23 | W57 | 01 | 0010 | ALPHA | 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.
