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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8736 | S20 | E37 | 01 | 0010 | ALPHA | Oct 22, 1999 | Oct 29, 1999 | Nov 11, 1999 |
| № 8735 | N18 | E24 | 06 | 0040 | BETA | Oct 21, 1999 | Oct 28, 1999 | Nov 10, 1999 |
| № 8734 | N17 | W07 | 02 | 0010 | ALPHA | Oct 18, 1999 | Oct 25, 1999 | Nov 8, 1999 |
| № 8732 | N21 | W23 | 23 | 0220 | BETA | Oct 17, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8731 | N13 | W17 | 54 | 1220 | BETA-GAMMA-DELTA | Oct 18, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8729 | N14 | W39 | 03 | 0010 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 5, 1999 |
| № 8728 | N23 | W38 | 10 | 0220 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 6, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
