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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 6, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8403 | N19 | E26 | 01 | 0060 | ALPHA | Dec 9, 1998 | Dec 16, 1998 | Dec 30, 1998 |
| № 8402 | N16 | E10 | 10 | 0360 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 28, 1998 |
| № 8401 | N11 | W40 | 03 | 0020 | BETA | Dec 4, 1998 | Dec 11, 1998 | Dec 24, 1998 |
| № 8398 | N17 | W60 | 02 | 0160 | BETA | Dec 2, 1998 | Dec 9, 1998 | Dec 23, 1998 |
| № 8397 | N15 | W08 | 01 | 0210 | ALPHA | Dec 6, 1998 | Dec 13, 1998 | Dec 27, 1998 |
| № 8395 | N19 | W49 | 03 | 0140 | ALPHA | Dec 3, 1998 | Dec 10, 1998 | Dec 24, 1998 |
| № 8393 | S16 | W97 | 01 | 0010 | ALPHA | Nov 30, 1998 | Dec 6, 1998 | Dec 20, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
