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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on July 13, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8634 | S18 | E69 | 01 | 0010 | ALPHA | Jul 19, 1999 | Jul 26, 1999 | Aug 9, 1999 |
| № 8633 | N42 | E21 | 04 | 0010 | BETA | Jul 16, 1999 | Jul 23, 1999 | Aug 7, 1999 |
| № 8632 | S19 | W72 | 06 | 0050 | BETA | Jul 9, 1999 | Jul 15, 1999 | Jul 29, 1999 |
| № 8631 | N11 | E64 | 01 | 0140 | ALPHA | Jul 19, 1999 | Jul 26, 1999 | Aug 8, 1999 |
| № 8628 | N17 | E04 | 21 | 0210 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 4, 1999 |
| № 8627 | S14 | E19 | 19 | 0210 | BETA | Jul 15, 1999 | Jul 22, 1999 | Aug 5, 1999 |
| № 8626 | S21 | W84 | 07 | 0090 | BETA | Jul 8, 1999 | Jul 14, 1999 | Jul 28, 1999 |
| № 8625 | S20 | W02 | 03 | 0020 | BETA | Jul 14, 1999 | Jul 21, 1999 | Aug 4, 1999 |
| № 8624 | N23 | W56 | 05 | 0020 | BETA | Jul 10, 1999 | Jul 17, 1999 | Jul 30, 1999 |
| № 8620 | N22 | W61 | 03 | 0040 | BETA | Jul 9, 1999 | Jul 16, 1999 | Jul 30, 1999 |
| № 8615 | S30 | W69 | 05 | 0170 | BETA | Jul 9, 1999 | Jul 16, 1999 | Jul 30, 1999 |
| № 8614 | N17 | W80 | 04 | 0160 | BETA | Jul 8, 1999 | Jul 15, 1999 | Jul 28, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to July 1999. The gray background is the average SSN index.
