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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8464 | N19 | E64 | 01 | 0070 | BETA | Feb 19, 1999 | Feb 26, 1999 | Mar 12, 1999 |
| № 8463 | S16 | E59 | 01 | 0040 | ALPHA | Feb 18, 1999 | Feb 25, 1999 | Mar 11, 1999 |
| № 8462 | N20 | E34 | 07 | 0030 | BETA | Feb 17, 1999 | Feb 23, 1999 | Mar 9, 1999 |
| № 8461 | S32 | E27 | 04 | 0010 | BETA | Feb 16, 1999 | Feb 23, 1999 | Mar 10, 1999 |
| № 8460 | S16 | E50 | 05 | 0050 | BETA | Feb 18, 1999 | Feb 25, 1999 | Mar 10, 1999 |
| № 8458 | S23 | E29 | 14 | 0650 | BETA-GAMMA | Feb 16, 1999 | Feb 23, 1999 | Mar 9, 1999 |
| № 8457 | N15 | E23 | 26 | 0350 | BETA-GAMMA | Feb 16, 1999 | Feb 23, 1999 | Mar 8, 1999 |
| № 8456 | N23 | E04 | 27 | 0170 | BETA-GAMMA | Feb 14, 1999 | Feb 21, 1999 | Mar 7, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to February 1999. The gray background is the average SSN index.
