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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 17, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8635 | N44 | W79 | 06 | 0140 | BETA | Jul 11, 1999 | Jul 19, 1999 | Aug 3, 1999 |
| № 8631 | N11 | E10 | 07 | 0170 | BETA | Jul 19, 1999 | Jul 26, 1999 | Aug 8, 1999 |
| № 8628 | N18 | W48 | 14 | 0140 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 4, 1999 |
| № 8627 | S14 | W34 | 12 | 0160 | BETA-GAMMA | Jul 15, 1999 | Jul 22, 1999 | Aug 5, 1999 |
| № 8625 | S18 | W54 | 08 | 0070 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 3, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to July 1999. The gray background is the average SSN index.
