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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 19, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8638 | S10 | E69 | 02 | 0010 | ALPHA | Jul 25, 1999 | Aug 1, 1999 | Aug 14, 1999 |
| № 8637 | N12 | W25 | 04 | 0020 | BETA | Jul 18, 1999 | Jul 25, 1999 | Aug 7, 1999 |
| № 8636 | N20 | E63 | 09 | 0310 | BETA | Jul 25, 1999 | Aug 1, 1999 | Aug 14, 1999 |
| № 8631 | N12 | W14 | 09 | 0090 | BETA | Jul 19, 1999 | Jul 26, 1999 | Aug 8, 1999 |
| № 8628 | N18 | W74 | 06 | 0100 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 4, 1999 |
| № 8627 | S13 | W58 | 14 | 0130 | BETA | Jul 15, 1999 | Jul 22, 1999 | Aug 5, 1999 |
| № 8625 | S17 | W77 | 05 | 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.
