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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 7, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8405 | S16 | E66 | 03 | 0110 | BETA | Dec 13, 1998 | Dec 20, 1998 | Jan 2, 1999 |
| № 8404 | S22 | E04 | 09 | 0080 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 29, 1998 |
| № 8403 | N19 | E17 | 04 | 0050 | BETA | Dec 9, 1998 | Dec 16, 1998 | Dec 30, 1998 |
| № 8402 | N16 | W00 | 12 | 0250 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 28, 1998 |
| № 8398 | N18 | W70 | 01 | 0200 | ALPHA | Dec 3, 1998 | Dec 9, 1998 | Dec 23, 1998 |
| № 8397 | N16 | W22 | 03 | 0210 | ALPHA | Dec 6, 1998 | Dec 13, 1998 | Dec 27, 1998 |
| № 8395 | N20 | W57 | 04 | 0140 | BETA | Dec 3, 1998 | Dec 10, 1998 | Dec 24, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
