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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 31, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8288 | S26 | E64 | 01 | 0010 | ALPHA | Aug 6, 1998 | Aug 13, 1998 | Aug 27, 1998 |
| № 8284 | N26 | W65 | 03 | 0040 | BETA | Jul 27, 1998 | Aug 3, 1998 | Aug 17, 1998 |
| № 8283 | N27 | E32 | 02 | 0040 | BETA | Aug 3, 1998 | Aug 10, 1998 | Aug 24, 1998 |
| № 8282 | N31 | W32 | 12 | 0280 | BETA | Jul 29, 1998 | Aug 5, 1998 | Aug 20, 1998 |
| № 8280 | S22 | W39 | 01 | 0310 | ALPHA | Jul 29, 1998 | Aug 5, 1998 | Aug 19, 1998 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1969 to July 1998. The gray background is the average SSN index.
