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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 21, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8641 | N32 | W57 | 02 | 0010 | BETA | Jul 17, 1999 | Jul 25, 1999 | Aug 8, 1999 |
| № 8640 | N17 | E76 | 01 | 0040 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8639 | N39 | W26 | 05 | 0020 | BETA | Jul 20, 1999 | Jul 27, 1999 | Aug 11, 1999 |
| № 8637 | N13 | W56 | 05 | 0030 | BETA | Jul 18, 1999 | Jul 25, 1999 | Aug 7, 1999 |
| № 8636 | N20 | E36 | 25 | 0390 | BETA-GAMMA | Jul 25, 1999 | Aug 1, 1999 | Aug 14, 1999 |
| № 8631 | N12 | W42 | 03 | 0030 | ALPHA | Jul 19, 1999 | Jul 26, 1999 | Aug 8, 1999 |
| № 8627 | S12 | W83 | 04 | 0030 | BETA | Jul 16, 1999 | Jul 23, 1999 | Aug 5, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to July 1999. The gray background is the average SSN index.
