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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 22, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8642 | S18 | E65 | 03 | 0020 | BETA | Jul 28, 1999 | Aug 4, 1999 | Aug 18, 1999 |
| № 8641 | N30 | W73 | 01 | 0000 | ALPHA | Jul 17, 1999 | Jul 24, 1999 | Aug 8, 1999 |
| № 8640 | N17 | E63 | 01 | 0080 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8639 | N38 | W37 | 11 | 0050 | BETA | Jul 20, 1999 | Jul 27, 1999 | Aug 11, 1999 |
| № 8637 | N12 | W66 | 01 | 0010 | ALPHA | Jul 18, 1999 | Jul 25, 1999 | Aug 7, 1999 |
| № 8636 | N21 | E25 | 35 | 0390 | BETA-GAMMA | Jul 25, 1999 | Aug 1, 1999 | Aug 15, 1999 |
| № 8631 | N12 | W54 | 02 | 0030 | ALPHA | Jul 19, 1999 | Jul 26, 1999 | Aug 8, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to July 1999. The gray background is the average SSN index.
