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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8278 | S28 | E54 | 01 | 0000 | ALPHA | Jul 26, 1998 | Aug 2, 1998 | Aug 16, 1998 |
| № 8277 | S13 | W24 | 06 | 0020 | BETA | Jul 20, 1998 | Jul 27, 1998 | Aug 9, 1998 |
| № 8276 | S19 | E50 | 04 | 0010 | BETA | Jul 26, 1998 | Aug 2, 1998 | Aug 15, 1998 |
| № 8274 | S20 | W44 | 09 | 0110 | BETA | Jul 18, 1998 | Jul 25, 1998 | Aug 8, 1998 |
| № 8270 | S21 | W62 | 08 | 0060 | BETA | Jul 17, 1998 | Jul 24, 1998 | Aug 7, 1998 |
| № 8269 | N20 | W60 | 02 | 0010 | 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.
