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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8746 | S15 | E28 | 04 | 0010 | BETA | Oct 31, 1999 | Nov 7, 1999 | Nov 21, 1999 |
| № 8745 | S14 | E54 | 02 | 0150 | ALPHA | Nov 2, 1999 | Nov 9, 1999 | Nov 23, 1999 |
| № 8744 | N09 | E16 | 05 | 0010 | BETA | Oct 30, 1999 | Nov 6, 1999 | Nov 20, 1999 |
| № 8743 | S14 | W07 | 03 | 0020 | BETA | Oct 28, 1999 | Nov 4, 1999 | Nov 18, 1999 |
| № 8742 | N08 | E29 | 25 | 0480 | BETA | Oct 31, 1999 | Nov 7, 1999 | Nov 21, 1999 |
| № 8741 | S25 | W03 | 19 | 0190 | BETA | Oct 29, 1999 | Nov 5, 1999 | Nov 19, 1999 |
| № 8739 | S12 | W23 | 42 | 0650 | BETA-GAMMA-DELTA | Oct 27, 1999 | Nov 3, 1999 | Nov 17, 1999 |
| № 8738 | N17 | W67 | 02 | 0090 | BETA | Oct 24, 1999 | Oct 31, 1999 | Nov 13, 1999 |
| № 8737 | S13 | W89 | 01 | 0140 | ALPHA | Oct 22, 1999 | Oct 29, 1999 | Nov 12, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to October 1999. The gray background is the average SSN index.
