No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on September 18, 1998. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8340 | N20 | E78 | 01 | 0150 | ALPHA | Sep 25, 1998 | Oct 2, 1998 | Oct 15, 1998 |
| № 8339 | S17 | E44 | 03 | 0010 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8338 | N33 | E70 | 01 | 0070 | ALPHA | Sep 24, 1998 | Oct 2, 1998 | Oct 16, 1998 |
| № 8337 | S40 | E30 | 04 | 0010 | BETA | Sep 21, 1998 | Sep 29, 1998 | Oct 14, 1998 |
| № 8336 | S28 | E39 | 03 | 0030 | BETA | Sep 22, 1998 | Sep 29, 1998 | Oct 13, 1998 |
| № 8335 | S22 | E03 | 04 | 0100 | BETA | Sep 19, 1998 | Sep 26, 1998 | Oct 10, 1998 |
| № 8331 | N27 | W56 | 03 | 0010 | BETA | Sep 14, 1998 | Sep 21, 1998 | Oct 6, 1998 |
| № 8330 | S23 | W63 | 01 | 0010 | ALPHA | Sep 14, 1998 | Sep 21, 1998 | Oct 5, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to September 1998. The gray background is the average SSN index.
