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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8423 | N23 | W28 | 06 | 0010 | BETA | Dec 27, 1998 | Jan 3, 1999 | Jan 17, 1999 |
| № 8422 | S23 | E38 | 16 | 0190 | BETA | Jan 1, 1999 | Jan 8, 1999 | Jan 22, 1999 |
| № 8421 | N27 | E26 | 32 | 0290 | BETA-GAMMA | Dec 31, 1998 | Jan 7, 1999 | Jan 21, 1999 |
| № 8420 | N20 | E12 | 03 | 0010 | BETA | Dec 30, 1998 | Jan 6, 1999 | Jan 20, 1999 |
| № 8419 | N27 | W27 | 23 | 0280 | BETA-GAMMA-DELTA | Dec 27, 1998 | Jan 3, 1999 | Jan 17, 1999 |
| № 8416 | N19 | W22 | 05 | 0020 | BETA | Dec 27, 1998 | Jan 3, 1999 | Jan 17, 1999 |
| № 8415 | N16 | W49 | 01 | 0000 | ALPHA | Dec 25, 1998 | Jan 1, 1999 | Jan 15, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
