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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on February 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8158 | S19 | E64 | 03 | 0010 | BETA | Feb 19, 1998 | Feb 26, 1998 | Mar 11, 1998 |
| № 8157 | N27 | E56 | 01 | 0000 | ALPHA | Feb 18, 1998 | Feb 25, 1998 | Mar 11, 1998 |
| № 8156 | S25 | E45 | 11 | 0210 | BETA | Feb 17, 1998 | Feb 24, 1998 | Mar 10, 1998 |
| № 8153 | S39 | W11 | 01 | 0000 | ALPHA | Feb 13, 1998 | Feb 20, 1998 | Mar 7, 1998 |
| № 8151 | S24 | W38 | 01 | 0000 | ALPHA | Feb 11, 1998 | Feb 18, 1998 | Mar 4, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to February 1998. The gray background is the average SSN index.
