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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 24, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8644 | S24 | E70 | 01 | 0030 | ALPHA | Jul 30, 1999 | Aug 6, 1999 | Aug 20, 1999 |
| № 8643 | N20 | W72 | 04 | 0010 | BETA | Jul 19, 1999 | Jul 26, 1999 | Aug 9, 1999 |
| № 8642 | S18 | E40 | 05 | 0060 | BETA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8640 | N17 | E39 | 01 | 0110 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8639 | N38 | W60 | 13 | 0390 | BETA | Jul 20, 1999 | Jul 27, 1999 | Aug 11, 1999 |
| № 8636 | N21 | E02 | 61 | 0600 | BETA-GAMMA | Jul 25, 1999 | Aug 1, 1999 | Aug 15, 1999 |
| № 8631 | N14 | W78 | 03 | 0010 | BETA | 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.
