No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on March 21, 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 | S09 | W21 | 09 | 0040 | BETA | Mar 21, 1999 | Mar 27, 1999 | Apr 10, 1999 |
| № 8495 | S21 | E44 | 02 | 0000 | BETA | Mar 26, 1999 | Apr 2, 1999 | Apr 15, 1999 |
| № 8494 | S23 | W01 | 04 | 0010 | BETA | Mar 22, 1999 | Mar 29, 1999 | Apr 12, 1999 |
| № 8493 | N20 | W39 | 11 | 0030 | BETA | Mar 19, 1999 | Mar 26, 1999 | Apr 9, 1999 |
| № 8490 | S19 | E24 | 03 | 0010 | BETA | Mar 24, 1999 | Mar 31, 1999 | Apr 14, 1999 |
| № 8488 | S26 | W47 | 06 | 0030 | BETA | Mar 19, 1999 | Mar 26, 1999 | Apr 9, 1999 |
| № 8487 | N17 | W62 | 03 | 0100 | ALPHA | Mar 18, 1999 | Mar 24, 1999 | Apr 7, 1999 |
| № 8484 | S25 | W74 | 01 | 0000 | ALPHA | Mar 17, 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.
