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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 9, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8407 | S17 | E12 | 08 | 0050 | BETA | Dec 11, 1998 | Dec 17, 1998 | Dec 31, 1998 |
| № 8406 | S27 | E67 | 07 | 0180 | BETA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8405 | S15 | E40 | 12 | 0040 | BETA | Dec 13, 1998 | Dec 19, 1998 | Jan 2, 1999 |
| № 8404 | S24 | W20 | 22 | 0280 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 29, 1998 |
| № 8403 | N20 | W10 | 01 | 0040 | ALPHA | Dec 9, 1998 | Dec 16, 1998 | Dec 30, 1998 |
| № 8402 | N17 | W26 | 11 | 0160 | BETA | Dec 8, 1998 | Dec 14, 1998 | Dec 28, 1998 |
| № 8399 | N29 | W75 | 03 | 0040 | BETA | Dec 4, 1998 | Dec 11, 1998 | Dec 25, 1998 |
| № 8397 | N16 | W45 | 02 | 0150 | ALPHA | Dec 6, 1998 | Dec 13, 1998 | Dec 27, 1998 |
| № 8395 | N20 | W74 | 02 | 0040 | ALPHA | Dec 4, 1998 | Dec 11, 1998 | Dec 25, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
