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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 12, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8411 | S28 | E64 | 01 | 0010 | ALPHA | Dec 18, 1998 | Dec 25, 1998 | Jan 8, 1999 |
| № 8410 | N23 | E77 | 01 | 0080 | ALPHA | Dec 19, 1998 | Dec 26, 1998 | Jan 9, 1999 |
| № 8409 | S29 | E27 | 13 | 0210 | BETA-GAMMA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8408 | S18 | E15 | 10 | 0020 | BETA-GAMMA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
| № 8407 | S16 | W33 | 03 | 0010 | BETA | Dec 10, 1998 | Dec 17, 1998 | Dec 31, 1998 |
| № 8406 | S28 | E16 | 01 | 0070 | ALPHA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
| № 8405 | S14 | W08 | 04 | 0020 | BETA | Dec 12, 1998 | Dec 19, 1998 | Jan 2, 1999 |
| № 8404 | S22 | W66 | 18 | 0410 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 29, 1998 |
| № 8403 | N20 | W54 | 01 | 0040 | ALPHA | Dec 9, 1998 | Dec 16, 1998 | Dec 30, 1998 |
| № 8402 | N16 | W71 | 03 | 0100 | BETA | Dec 8, 1998 | Dec 14, 1998 | Dec 28, 1998 |
| № 8397 | N16 | W89 | 01 | 0070 | ALPHA | Dec 6, 1998 | Dec 13, 1998 | Dec 27, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to December 1998. The gray background is the average SSN index.
