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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on June 28, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8612 | S17 | E21 | 03 | 0030 | ALPHA | Jul 1, 1999 | Jul 7, 1999 | Jul 21, 1999 |
| № 8611 | S25 | E61 | 05 | 0040 | BETA | Jul 4, 1999 | Jul 11, 1999 | Jul 25, 1999 |
| № 8610 | N12 | E13 | 03 | 0010 | BETA | Jun 30, 1999 | Jul 7, 1999 | Jul 20, 1999 |
| № 8609 | N17 | E04 | 02 | 0000 | BETA | Jun 29, 1999 | Jul 6, 1999 | Jul 20, 1999 |
| № 8607 | N23 | W68 | 01 | 0000 | ALPHA | Jun 24, 1999 | Jul 1, 1999 | Jul 15, 1999 |
| № 8606 | N17 | W06 | 16 | 0090 | BETA | Jun 29, 1999 | Jul 5, 1999 | Jul 19, 1999 |
| № 8604 | N14 | W92 | 02 | 0060 | BETA | Jun 22, 1999 | Jun 29, 1999 | Jul 12, 1999 |
| № 8603 | S15 | E30 | 39 | 0360 | BETA | Jul 1, 1999 | Jul 8, 1999 | Jul 22, 1999 |
| № 8602 | N18 | E22 | 25 | 0350 | BETA | Jul 1, 1999 | Jul 8, 1999 | Jul 21, 1999 |
| № 8600 | N20 | W88 | 01 | 0000 | ALPHA | Jun 22, 1999 | Jun 29, 1999 | Jul 13, 1999 |
| № 8599 | S16 | W00 | 16 | 0070 | BETA | Jun 29, 1999 | Jul 6, 1999 | Jul 20, 1999 |
| № 8598 | N22 | W11 | 65 | 0530 | BETA-GAMMA | Jun 28, 1999 | Jul 5, 1999 | Jul 19, 1999 |
| № 8594 | N13 | W13 | 22 | 0120 | BETA | Jun 28, 1999 | Jul 5, 1999 | Jul 18, 1999 |
| № 8592 | N22 | W33 | 01 | 0040 | ALPHA | Jun 26, 1999 | Jul 3, 1999 | Jul 17, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to June 1999. The gray background is the average SSN index.
