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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8122 | N31 | W18 | 14 | 0120 | BETA | Dec 13, 1997 | Dec 20, 1997 | Jan 3, 1998 |
| № 8119 | N33 | W49 | 08 | 0080 | BETA | Dec 10, 1997 | Dec 17, 1997 | Jan 1, 1998 |
| № 8118 | S38 | W14 | 01 | 0050 | ALPHA | Dec 13, 1997 | Dec 20, 1997 | Jan 4, 1998 |
| № 8116 | N26 | W53 | 01 | 0000 | ALPHA | Dec 10, 1997 | Dec 17, 1997 | Dec 31, 1997 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1968 to December 1997. The gray background is the average SSN index.
