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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8497 | N30 | E57 | 01 | 0060 | ALPHA | Mar 29, 1999 | Apr 5, 1999 | Apr 19, 1999 |
| № 8496 | S10 | W47 | 05 | 0040 | BETA | Mar 21, 1999 | Mar 27, 1999 | Apr 10, 1999 |
| № 8495 | S21 | E20 | 02 | 0000 | ALPHA | Mar 26, 1999 | Apr 2, 1999 | Apr 15, 1999 |
| № 8494 | S23 | W27 | 03 | 0010 | BETA | Mar 22, 1999 | Mar 29, 1999 | Apr 12, 1999 |
| № 8493 | N19 | W65 | 05 | 0020 | BETA | Mar 19, 1999 | Mar 26, 1999 | Apr 9, 1999 |
| № 8490 | S17 | W05 | 01 | 0000 | ALPHA | Mar 24, 1999 | Mar 31, 1999 | Apr 13, 1999 |
| № 8488 | S26 | W75 | 02 | 0000 | ALPHA | Mar 18, 1999 | Mar 25, 1999 | Apr 8, 1999 |
| № 8487 | N16 | W89 | 02 | 0030 | BETA | Mar 17, 1999 | Mar 24, 1999 | Apr 7, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to March 1999. The gray background is the average SSN index.
