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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 23, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8643 | N21 | W62 | 03 | 0010 | BETA | Jul 19, 1999 | Jul 26, 1999 | Aug 9, 1999 |
| № 8642 | S18 | E51 | 04 | 0040 | BETA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8640 | N17 | E49 | 01 | 0090 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8639 | N38 | W50 | 12 | 0400 | BETA | Jul 20, 1999 | Jul 27, 1999 | Aug 11, 1999 |
| № 8636 | N21 | E12 | 45 | 0550 | BETA-GAMMA-DELTA | Jul 25, 1999 | Aug 1, 1999 | Aug 15, 1999 |
| № 8631 | N11 | W69 | 02 | 0020 | 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.
