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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 20, 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 | N20 | E49 | 18 | 0270 | BETA | Dec 25, 1998 | Jan 1, 1999 | Jan 14, 1999 |
| № 8414 | N27 | E13 | 03 | 0000 | BETA | Dec 22, 1998 | Dec 29, 1998 | Jan 12, 1999 |
| № 8410 | N24 | W29 | 05 | 0030 | BETA | Dec 19, 1998 | Dec 26, 1998 | Jan 9, 1999 |
| № 8409 | S28 | W75 | 10 | 0210 | BETA-GAMMA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8408 | S18 | W91 | 02 | 0040 | ALPHA | 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.
