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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 15, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8412 | S17 | W39 | 04 | 0040 | BETA | Dec 13, 1998 | Dec 20, 1998 | Jan 3, 1999 |
| № 8411 | S30 | E25 | 04 | 0040 | BETA | Dec 18, 1998 | Dec 25, 1998 | Jan 8, 1999 |
| № 8410 | N26 | E34 | 04 | 0070 | BETA | Dec 19, 1998 | Dec 26, 1998 | Jan 9, 1999 |
| № 8409 | S29 | W13 | 22 | 0260 | BETA-GAMMA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8408 | S19 | W31 | 18 | 0250 | BETA-GAMMA | Dec 14, 1998 | Dec 21, 1998 | Jan 3, 1999 |
| № 8406 | S28 | W25 | 01 | 0030 | ALPHA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
