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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on October 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8364 | N18 | E26 | 04 | 0010 | BETA | Oct 21, 1998 | Oct 28, 1998 | Nov 10, 1998 |
| № 8363 | N25 | E19 | 14 | 0100 | BETA | Oct 20, 1998 | Oct 27, 1998 | Nov 10, 1998 |
| № 8362 | N20 | E48 | 02 | 0030 | ALPHA | Oct 23, 1998 | Oct 29, 1998 | Nov 12, 1998 |
| № 8361 | N14 | W36 | 09 | 0030 | BETA | Oct 16, 1998 | Oct 23, 1998 | Nov 6, 1998 |
| № 8360 | S19 | W50 | 08 | 0390 | BETA | Oct 15, 1998 | Oct 22, 1998 | Nov 5, 1998 |
| № 8358 | N16 | W53 | 10 | 0170 | BETA-GAMMA | Oct 15, 1998 | Oct 22, 1998 | Nov 4, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to October 1998. The gray background is the average SSN index.
