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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8721 | S17 | E58 | 06 | 0050 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8720 | N14 | E67 | 04 | 0020 | BETA | Oct 10, 1999 | Oct 17, 1999 | Oct 30, 1999 |
| № 8719 | S20 | E52 | 03 | 0060 | BETA | Oct 9, 1999 | Oct 16, 1999 | Oct 29, 1999 |
| № 8718 | S27 | E04 | 03 | 0010 | BETA | Oct 5, 1999 | Oct 12, 1999 | Oct 26, 1999 |
| № 8717 | S26 | W57 | 02 | 0010 | BETA | Sep 30, 1999 | Oct 7, 1999 | Oct 21, 1999 |
| № 8716 | N20 | E62 | 05 | 0200 | BETA | Oct 10, 1999 | Oct 16, 1999 | Oct 30, 1999 |
| № 8714 | N14 | E19 | 02 | 0020 | ALPHA | Oct 6, 1999 | Oct 13, 1999 | Oct 27, 1999 |
| № 8713 | S12 | E08 | 01 | 0000 | ALPHA | Oct 5, 1999 | Oct 12, 1999 | Oct 26, 1999 |
| № 8710 | N22 | W11 | 01 | 0000 | ALPHA | Oct 4, 1999 | Oct 11, 1999 | Oct 25, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
