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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 18, 1997. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8123 | N18 | E20 | 10 | 0130 | BETA | Dec 21, 1997 | Dec 27, 1997 | Jan 10, 1998 |
| № 8122 | N32 | W85 | 01 | 0050 | ALPHA | Dec 12, 1997 | Dec 19, 1997 | Jan 3, 1998 |
| № 8118 | S39 | W78 | 01 | 0020 | ALPHA | Dec 13, 1997 | Dec 20, 1997 | Jan 4, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to December 1997. The gray background is the average SSN index.
