No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 30, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8714 | N11 | E74 | 01 | 0000 | ALPHA | Oct 6, 1999 | Oct 13, 1999 | Oct 27, 1999 |
| № 8713 | S13 | E64 | 02 | 0000 | ALPHA | Oct 6, 1999 | Oct 13, 1999 | Oct 26, 1999 |
| № 8712 | S13 | W04 | 04 | 0010 | BETA | Oct 1, 1999 | Oct 7, 1999 | Oct 21, 1999 |
| № 8711 | N22 | W43 | 04 | 0020 | BETA | Sep 28, 1999 | Oct 4, 1999 | Oct 18, 1999 |
| № 8710 | N19 | E40 | 01 | 0020 | ALPHA | Oct 4, 1999 | Oct 11, 1999 | Oct 25, 1999 |
| № 8706 | N20 | W51 | 01 | 0060 | ALPHA | Sep 27, 1999 | Oct 4, 1999 | Oct 18, 1999 |
| № 8704 | S19 | W88 | 01 | 0030 | ALPHA | Sep 24, 1999 | Oct 1, 1999 | Oct 15, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to September 1999. The gray background is the average SSN index.
