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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8751 | N20 | E63 | 01 | 0030 | ALPHA | Nov 6, 1999 | Nov 13, 1999 | Nov 27, 1999 |
| № 8750 | S18 | W07 | 04 | 0010 | BETA | Nov 1, 1999 | Nov 8, 1999 | Nov 21, 1999 |
| № 8749 | S21 | E28 | 04 | 0010 | BETA | Nov 3, 1999 | Nov 10, 1999 | Nov 24, 1999 |
| № 8748 | N19 | W11 | 06 | 0040 | BETA | Oct 31, 1999 | Nov 7, 1999 | Nov 21, 1999 |
| № 8747 | N12 | E27 | 13 | 0210 | BETA | Nov 3, 1999 | Nov 10, 1999 | Nov 24, 1999 |
| № 8745 | S15 | E12 | 10 | 0110 | BETA | Nov 2, 1999 | Nov 9, 1999 | Nov 23, 1999 |
| № 8743 | S14 | W50 | 10 | 0090 | BETA | Oct 28, 1999 | Nov 4, 1999 | Nov 18, 1999 |
| № 8742 | N10 | W14 | 34 | 0370 | BETA | Oct 31, 1999 | Nov 7, 1999 | Nov 21, 1999 |
| № 8741 | S24 | W45 | 13 | 0150 | BETA | Oct 29, 1999 | Nov 5, 1999 | Nov 19, 1999 |
| № 8739 | S10 | W67 | 22 | 0390 | BETA | Oct 27, 1999 | Nov 3, 1999 | Nov 17, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
