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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 10, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8729 | N11 | E70 | 08 | 0040 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 5, 1999 |
| № 8728 | N21 | E65 | 10 | 0150 | BETA | Oct 16, 1999 | Oct 23, 1999 | Nov 5, 1999 |
| № 8727 | N18 | E28 | 03 | 0010 | ALPHA | Oct 13, 1999 | Oct 20, 1999 | Nov 2, 1999 |
| № 8726 | S19 | W15 | 05 | 0010 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 30, 1999 |
| № 8725 | S25 | E17 | 02 | 0040 | ALPHA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8724 | N22 | W59 | 03 | 0000 | BETA | Oct 6, 1999 | Oct 13, 1999 | Oct 27, 1999 |
| № 8723 | N20 | E17 | 07 | 0010 | BETA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8722 | N15 | W41 | 01 | 0000 | ALPHA | Oct 8, 1999 | Oct 14, 1999 | Oct 28, 1999 |
| № 8721 | S17 | W21 | 07 | 0030 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8720 | N14 | W08 | 20 | 0030 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 31, 1999 |
| № 8719 | S22 | W29 | 02 | 0070 | ALPHA | Oct 9, 1999 | Oct 15, 1999 | Oct 29, 1999 |
| № 8718 | S26 | W78 | 02 | 0020 | ALPHA | Oct 5, 1999 | Oct 12, 1999 | Oct 26, 1999 |
| № 8716 | N22 | W17 | 11 | 0170 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8714 | N18 | W53 | 01 | 0000 | ALPHA | Oct 7, 1999 | Oct 14, 1999 | Oct 27, 1999 |
| № 8713 | S12 | W67 | 03 | 0010 | BETA | Oct 6, 1999 | Oct 13, 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.
