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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 19, 1998. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8415 | N19 | E62 | 11 | 0190 | BETA | Dec 25, 1998 | Jan 1, 1999 | Jan 14, 1999 |
| № 8410 | N24 | W16 | 06 | 0050 | BETA | Dec 19, 1998 | Dec 26, 1998 | Jan 9, 1999 |
| № 8409 | S26 | W62 | 16 | 0150 | BETA-GAMMA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8408 | S17 | W78 | 03 | 0120 | BETA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
