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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 18, 1999. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8636 | N20 | E75 | 04 | 0070 | BETA | Jul 25, 1999 | Jul 31, 1999 | Aug 14, 1999 |
| № 8631 | N11 | W01 | 07 | 0080 | BETA | Jul 19, 1999 | Jul 26, 1999 | Aug 8, 1999 |
| № 8628 | N19 | W60 | 11 | 0100 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 4, 1999 |
| № 8627 | S13 | W45 | 16 | 0150 | BETA-GAMMA-DELTA | Jul 15, 1999 | Jul 22, 1999 | Aug 5, 1999 |
| № 8625 | S18 | W64 | 09 | 0080 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 4, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to July 1999. The gray background is the average SSN index.
