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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 15, 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 | N19 | E63 | 03 | 0010 | BETA | Dec 21, 1997 | Dec 28, 1997 | Jan 10, 1998 |
| № 8122 | N29 | W46 | 09 | 0110 | BETA | Dec 12, 1997 | Dec 19, 1997 | Jan 2, 1998 |
| № 8119 | N31 | W79 | 02 | 0070 | BETA | Dec 10, 1997 | Dec 17, 1997 | Dec 31, 1997 |
| № 8118 | S41 | W37 | 01 | 0040 | ALPHA | Dec 13, 1997 | Dec 20, 1997 | Jan 4, 1998 |
| № 8116 | N25 | W80 | 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.
