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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 9, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8728 | N22 | E76 | 01 | 0030 | ALPHA | Oct 16, 1999 | Oct 23, 1999 | Nov 5, 1999 |
| № 8727 | N18 | E42 | 03 | 0040 | BETA | Oct 13, 1999 | Oct 20, 1999 | Nov 3, 1999 |
| № 8726 | S22 | E03 | 01 | 0010 | ALPHA | Oct 10, 1999 | Oct 17, 1999 | Oct 31, 1999 |
| № 8725 | S25 | E30 | 01 | 0040 | ALPHA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8724 | N19 | W48 | 02 | 0010 | BETA | Oct 6, 1999 | Oct 13, 1999 | Oct 27, 1999 |
| № 8723 | N20 | E29 | 01 | 0020 | ALPHA | Oct 12, 1999 | Oct 19, 1999 | Nov 2, 1999 |
| № 8722 | N15 | W31 | 04 | 0020 | BETA | Oct 7, 1999 | Oct 14, 1999 | Oct 28, 1999 |
| № 8721 | S17 | W10 | 03 | 0040 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8720 | N13 | E03 | 16 | 0050 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 31, 1999 |
| № 8719 | S22 | W16 | 02 | 0070 | ALPHA | Oct 9, 1999 | Oct 16, 1999 | Oct 29, 1999 |
| № 8718 | S27 | W64 | 01 | 0030 | ALPHA | Oct 5, 1999 | Oct 12, 1999 | Oct 26, 1999 |
| № 8716 | N22 | W07 | 03 | 0200 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8714 | N14 | W41 | 02 | 0000 | ALPHA | Oct 7, 1999 | Oct 14, 1999 | Oct 27, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
