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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on August 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8306 | N27 | E53 | 01 | 0050 | ALPHA | Aug 23, 1998 | Aug 30, 1998 | Sep 13, 1998 |
| № 8305 | S26 | W19 | 07 | 0030 | BETA | Aug 18, 1998 | Aug 25, 1998 | Sep 8, 1998 |
| № 8304 | S30 | E40 | 04 | 0110 | BETA | Aug 22, 1998 | Aug 29, 1998 | Sep 13, 1998 |
| № 8301 | S21 | W32 | 04 | 0100 | BETA | Aug 17, 1998 | Aug 24, 1998 | Sep 6, 1998 |
| № 8299 | N19 | W58 | 11 | 0390 | BETA-GAMMA | Aug 15, 1998 | Aug 22, 1998 | Sep 4, 1998 |
| № 8297 | N32 | W69 | 03 | 0270 | BETA | Aug 14, 1998 | Aug 21, 1998 | Sep 4, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to August 1998. The gray background is the average SSN index.
