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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on January 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8139 | N14 | E37 | 03 | 0010 | ALPHA | Jan 22, 1998 | Jan 29, 1998 | Feb 11, 1998 |
| № 8138 | S43 | W61 | 04 | 0030 | BETA | Jan 14, 1998 | Jan 21, 1998 | Feb 6, 1998 |
| № 8137 | S15 | W02 | 02 | 0010 | BETA | Jan 19, 1998 | Jan 26, 1998 | Feb 8, 1998 |
| № 8136 | N15 | W37 | 04 | 0030 | BETA | Jan 16, 1998 | Jan 23, 1998 | Feb 6, 1998 |
| № 8135 | S18 | E15 | 06 | 0020 | BETA | Jan 20, 1998 | Jan 27, 1998 | Feb 10, 1998 |
| № 8131 | S23 | W61 | 10 | 0230 | BETA-GAMMA | Jan 14, 1998 | Jan 21, 1998 | Feb 4, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to January 1998. The gray background is the average SSN index.
