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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 15, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8733 | N26 | W23 | 01 | 0000 | ALPHA | Oct 14, 1999 | Oct 21, 1999 | Nov 4, 1999 |
| № 8732 | N20 | E17 | 21 | 0090 | BETA | Oct 17, 1999 | Oct 24, 1999 | Nov 7, 1999 |
| № 8731 | N19 | E25 | 45 | 0790 | BETA-GAMMA-DELTA | Oct 18, 1999 | Oct 25, 1999 | Nov 7, 1999 |
| № 8729 | N12 | E04 | 15 | 0030 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 6, 1999 |
| № 8728 | N22 | E01 | 21 | 0330 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 6, 1999 |
| № 8727 | N20 | W36 | 07 | 0030 | BETA | Oct 13, 1999 | Oct 20, 1999 | Nov 3, 1999 |
| № 8725 | S23 | W52 | 01 | 0010 | ALPHA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8720 | N17 | W77 | 02 | 0010 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 31, 1999 |
| № 8716 | N22 | W82 | 03 | 0100 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 30, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
