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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 25, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8646 | N12 | W22 | 04 | 0020 | BETA | Jul 25, 1999 | Jul 31, 1999 | Aug 14, 1999 |
| № 8645 | S26 | E65 | 05 | 0190 | BETA | Jul 31, 1999 | Aug 7, 1999 | Aug 21, 1999 |
| № 8644 | S25 | E51 | 02 | 0040 | BETA | Jul 30, 1999 | Aug 6, 1999 | Aug 20, 1999 |
| № 8643 | N21 | W94 | 02 | 0010 | ALPHA | Jul 19, 1999 | Jul 26, 1999 | Aug 9, 1999 |
| № 8642 | S18 | E22 | 07 | 0030 | BETA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8640 | N17 | E21 | 01 | 0120 | ALPHA | Jul 28, 1999 | Aug 4, 1999 | Aug 17, 1999 |
| № 8639 | N38 | W77 | 14 | 0290 | BETA | Jul 20, 1999 | Jul 27, 1999 | Aug 11, 1999 |
| № 8636 | N21 | W17 | 58 | 0570 | BETA-GAMMA | Jul 25, 1999 | Aug 1, 1999 | Aug 15, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to July 1999. The gray background is the average SSN index.
