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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 11, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8730 | S11 | E03 | 04 | 0010 | BETA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8729 | N12 | E55 | 14 | 0060 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 6, 1999 |
| № 8728 | N22 | E47 | 13 | 0340 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 6, 1999 |
| № 8727 | N18 | E09 | 03 | 0010 | BETA | Oct 13, 1999 | Oct 20, 1999 | Nov 3, 1999 |
| № 8725 | S25 | W01 | 03 | 0030 | BETA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8724 | N20 | W83 | 03 | 0020 | BETA | Oct 6, 1999 | Oct 13, 1999 | Oct 27, 1999 |
| № 8723 | N20 | W02 | 03 | 0010 | BETA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8721 | S17 | W40 | 02 | 0010 | ALPHA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8720 | N14 | W30 | 08 | 0020 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 30, 1999 |
| № 8719 | S21 | W47 | 01 | 0050 | ALPHA | Oct 9, 1999 | Oct 16, 1999 | Oct 29, 1999 |
| № 8716 | N21 | W37 | 07 | 0160 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8714 | N16 | W74 | 02 | 0020 | BETA | Oct 7, 1999 | Oct 13, 1999 | Oct 27, 1999 |
| № 8713 | S12 | W90 | 02 | 0020 | BETA | Oct 5, 1999 | Oct 12, 1999 | Oct 26, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
