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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 4, 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 | N20 | E52 | 01 | 0020 | ALPHA | Dec 9, 1998 | Dec 16, 1998 | Dec 29, 1998 |
| № 8402 | N18 | E41 | 12 | 0270 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 29, 1998 |
| № 8401 | N12 | W11 | 05 | 0030 | BETA | Dec 4, 1998 | Dec 11, 1998 | Dec 24, 1998 |
| № 8399 | N29 | W20 | 01 | 0000 | ALPHA | Dec 3, 1998 | Dec 10, 1998 | Dec 24, 1998 |
| № 8398 | N18 | W38 | 07 | 0020 | BETA | Dec 2, 1998 | Dec 9, 1998 | Dec 23, 1998 |
| № 8397 | N14 | E21 | 07 | 0200 | BETA | Dec 6, 1998 | Dec 13, 1998 | Dec 27, 1998 |
| № 8395 | N18 | W25 | 21 | 0200 | BETA-GAMMA | Dec 3, 1998 | Dec 10, 1998 | Dec 24, 1998 |
| № 8393 | S15 | W62 | 02 | 0090 | ALPHA | Nov 30, 1998 | Dec 7, 1998 | Dec 21, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
