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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 20, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8639 | N38 | W14 | 05 | 0010 | BETA | Jul 20, 1999 | Jul 27, 1999 | Aug 11, 1999 |
| № 8638 | S10 | E51 | 02 | 0010 | ALPHA | Jul 25, 1999 | Aug 1, 1999 | Aug 14, 1999 |
| № 8637 | N12 | W42 | 06 | 0020 | BETA | Jul 18, 1999 | Jul 25, 1999 | Aug 7, 1999 |
| № 8636 | N20 | E51 | 18 | 0330 | BETA-GAMMA | Jul 25, 1999 | Aug 1, 1999 | Aug 15, 1999 |
| № 8631 | N12 | W29 | 05 | 0060 | BETA | Jul 19, 1999 | Jul 26, 1999 | Aug 8, 1999 |
| № 8628 | N20 | W88 | 02 | 0070 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 4, 1999 |
| № 8627 | S13 | W71 | 05 | 0060 | BETA | Jul 16, 1999 | Jul 22, 1999 | Aug 5, 1999 |
| № 8625 | S15 | W90 | 03 | 0060 | 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.
