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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8425 | S26 | E51 | 02 | 0010 | BETA | Jan 5, 1999 | Jan 12, 1999 | Jan 26, 1999 |
| № 8423 | N21 | W72 | 01 | 0030 | ALPHA | Dec 26, 1998 | Jan 2, 1999 | Jan 16, 1999 |
| № 8422 | S23 | W01 | 17 | 0130 | BETA | Jan 1, 1999 | Jan 8, 1999 | Jan 22, 1999 |
| № 8421 | N26 | W14 | 70 | 0710 | BETA-GAMMA-DELTA | Dec 31, 1998 | Jan 7, 1999 | Jan 21, 1999 |
| № 8420 | N19 | W17 | 02 | 0010 | ALPHA | Dec 31, 1998 | Jan 7, 1999 | Jan 20, 1999 |
| № 8419 | N26 | W65 | 21 | 0360 | BETA-GAMMA | Dec 27, 1998 | Jan 3, 1999 | Jan 17, 1999 |
| № 8416 | N18 | W60 | 03 | 0020 | BETA | Dec 27, 1998 | Jan 3, 1999 | Jan 17, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
