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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8130 | S29 | E12 | 11 | 0050 | BETA | Jan 2, 1998 | Jan 9, 1998 | Jan 23, 1998 |
| № 8126 | N21 | W14 | 07 | 0220 | BETA-GAMMA | Dec 31, 1997 | Jan 7, 1998 | Jan 21, 1998 |
| № 8124 | S22 | W59 | 08 | 0160 | BETA-GAMMA-DELTA | 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.
