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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8467 | N16 | E67 | 01 | 0060 | ALPHA | Feb 23, 1999 | Mar 2, 1999 | Mar 15, 1999 |
| № 8466 | S23 | E61 | 01 | 0000 | ALPHA | Feb 23, 1999 | Mar 1, 1999 | Mar 15, 1999 |
| № 8464 | N19 | E17 | 07 | 0080 | BETA | Feb 19, 1999 | Feb 26, 1999 | Mar 12, 1999 |
| № 8463 | S17 | E08 | 01 | 0070 | ALPHA | Feb 18, 1999 | Feb 25, 1999 | Mar 11, 1999 |
| № 8462 | N18 | W18 | 15 | 0150 | BETA | Feb 16, 1999 | Feb 23, 1999 | Mar 9, 1999 |
| № 8460 | S18 | W08 | 03 | 0020 | BETA | Feb 17, 1999 | Feb 24, 1999 | Mar 10, 1999 |
| № 8459 | S30 | W55 | 07 | 0090 | BETA | Feb 14, 1999 | Feb 21, 1999 | Mar 7, 1999 |
| № 8458 | S22 | W21 | 13 | 0610 | BETA | Feb 16, 1999 | Feb 23, 1999 | Mar 9, 1999 |
| № 8457 | N14 | W28 | 24 | 0550 | BETA-GAMMA | Feb 16, 1999 | Feb 23, 1999 | Mar 8, 1999 |
| № 8456 | N22 | W47 | 04 | 0030 | BETA | 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.
