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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 16, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8413 | N18 | E10 | 02 | 0000 | BETA | Dec 18, 1998 | Dec 25, 1998 | Jan 8, 1999 |
| № 8412 | S15 | W56 | 01 | 0000 | ALPHA | Dec 13, 1998 | Dec 20, 1998 | Jan 2, 1999 |
| № 8411 | S29 | E11 | 02 | 0000 | BETA | Dec 18, 1998 | Dec 25, 1998 | Jan 8, 1999 |
| № 8410 | N25 | E19 | 01 | 0090 | ALPHA | Dec 19, 1998 | Dec 26, 1998 | Jan 9, 1999 |
| № 8409 | S28 | W28 | 20 | 0270 | BETA-GAMMA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8408 | S18 | W43 | 11 | 0270 | BETA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
| № 8406 | S27 | W38 | 01 | 0020 | 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.
