No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on December 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8415 | N19 | E72 | 05 | 0010 | BETA | Dec 25, 1998 | Dec 31, 1998 | Jan 14, 1999 |
| № 8414 | N25 | E34 | 01 | 0000 | ALPHA | Dec 22, 1998 | Dec 29, 1998 | Jan 12, 1999 |
| № 8410 | N24 | W04 | 02 | 0050 | ALPHA | Dec 19, 1998 | Dec 26, 1998 | Jan 9, 1999 |
| № 8409 | S28 | W50 | 16 | 0190 | BETA-GAMMA | Dec 15, 1998 | Dec 22, 1998 | Jan 5, 1999 |
| № 8408 | S17 | W65 | 06 | 0180 | BETA | Dec 14, 1998 | Dec 21, 1998 | Jan 4, 1999 |
| № 8406 | S26 | W59 | 03 | 0030 | BETA | 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.
