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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8414 | N21 | E46 | 04 | 0010 | BETA | Dec 22, 1998 | Dec 29, 1998 | Jan 11, 1999 |
| № 8412 | S15 | W70 | 01 | 0000 | ALPHA | Dec 13, 1998 | Dec 20, 1998 | Jan 2, 1999 |
| № 8411 | S28 | W03 | 02 | 0010 | BETA | Dec 18, 1998 | Dec 25, 1998 | Jan 8, 1999 |
| № 8410 | N23 | E06 | 02 | 0060 | BETA | Dec 19, 1998 | Dec 26, 1998 | Jan 8, 1999 |
| № 8409 | S27 | W41 | 26 | 0250 | BETA-GAMMA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8408 | S17 | W56 | 12 | 0220 | BETA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
| № 8406 | S27 | W51 | 01 | 0020 | 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.
