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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8275 | N16 | E51 | 01 | 0010 | ALPHA | Jul 23, 1998 | Jul 30, 1998 | Aug 12, 1998 |
| № 8274 | S20 | W05 | 11 | 0150 | BETA | Jul 19, 1998 | Jul 26, 1998 | Aug 8, 1998 |
| № 8273 | S28 | W07 | 07 | 0030 | BETA | Jul 18, 1998 | Jul 25, 1998 | Aug 9, 1998 |
| № 8272 | S28 | E31 | 03 | 0010 | BETA | Jul 21, 1998 | Jul 28, 1998 | Aug 12, 1998 |
| № 8270 | S22 | W25 | 06 | 0040 | BETA | Jul 17, 1998 | Jul 24, 1998 | Aug 7, 1998 |
| № 8269 | N24 | W23 | 01 | 0000 | ALPHA | Jul 17, 1998 | Jul 24, 1998 | Aug 7, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to July 1998. The gray background is the average SSN index.
