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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 11, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8409 | S29 | E43 | 04 | 0150 | BETA | Dec 15, 1998 | Dec 22, 1998 | Jan 6, 1999 |
| № 8408 | S18 | E27 | 05 | 0010 | BETA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
| № 8407 | S17 | W20 | 08 | 0020 | BETA | Dec 10, 1998 | Dec 17, 1998 | Dec 31, 1998 |
| № 8406 | S27 | E28 | 01 | 0050 | ALPHA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
| № 8405 | S15 | E06 | 07 | 0020 | BETA | Dec 12, 1998 | Dec 19, 1998 | Jan 2, 1999 |
| № 8404 | S22 | W51 | 22 | 0320 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 29, 1998 |
| № 8403 | N21 | W41 | 01 | 0030 | ALPHA | Dec 9, 1998 | Dec 16, 1998 | Dec 30, 1998 |
| № 8402 | N17 | W56 | 05 | 0120 | BETA | Dec 8, 1998 | Dec 15, 1998 | Dec 28, 1998 |
| № 8397 | N16 | W76 | 02 | 0080 | 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.
