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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 29, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8653 | N28 | W27 | 02 | 0030 | BETA | Jul 28, 1999 | Aug 4, 1999 | Aug 18, 1999 |
| № 8652 | N17 | W34 | 04 | 0010 | BETA | Jul 27, 1999 | Aug 3, 1999 | Aug 17, 1999 |
| № 8651 | N24 | E68 | 07 | 0100 | BETA | Aug 4, 1999 | Aug 11, 1999 | Aug 25, 1999 |
| № 8650 | N16 | E67 | 01 | 0070 | ALPHA | Aug 4, 1999 | Aug 11, 1999 | Aug 24, 1999 |
| № 8649 | S15 | W02 | 17 | 0100 | BETA | Jul 30, 1999 | Aug 5, 1999 | Aug 19, 1999 |
| № 8648 | N22 | E45 | 04 | 0030 | BETA | Aug 2, 1999 | Aug 9, 1999 | Aug 23, 1999 |
| № 8647 | S18 | E27 | 12 | 0090 | BETA | Aug 1, 1999 | Aug 8, 1999 | Aug 21, 1999 |
| № 8645 | S26 | E25 | 24 | 0490 | BETA | Aug 1, 1999 | Aug 8, 1999 | Aug 22, 1999 |
| № 8644 | S26 | E05 | 01 | 0040 | ALPHA | Jul 30, 1999 | Aug 6, 1999 | Aug 20, 1999 |
| № 8642 | S23 | W24 | 02 | 0010 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 18, 1999 |
| № 8640 | N17 | W25 | 02 | 0070 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8636 | N21 | W65 | 22 | 0500 | BETA | Jul 25, 1999 | Aug 1, 1999 | Aug 14, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to July 1999. The gray background is the average SSN index.
