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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8128 | N28 | W54 | 03 | 0010 | BETA | Dec 25, 1997 | Jan 1, 1998 | Jan 15, 1998 |
| № 8126 | N21 | E28 | 03 | 0180 | ALPHA | Dec 31, 1997 | Jan 7, 1998 | Jan 21, 1998 |
| № 8124 | S21 | W12 | 20 | 0230 | BETA-GAMMA | Dec 28, 1997 | Jan 4, 1998 | Jan 18, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to December 1997. The gray background is the average SSN index.
