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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on June 18, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8591 | N12 | E12 | 03 | 0010 | BETA | Jun 20, 1999 | Jun 27, 1999 | Jul 10, 1999 |
| № 8590 | S22 | W17 | 03 | 0010 | BETA | Jun 18, 1999 | Jun 25, 1999 | Jul 9, 1999 |
| № 8589 | N27 | W15 | 03 | 0030 | BETA | Jun 18, 1999 | Jun 25, 1999 | Jul 9, 1999 |
| № 8588 | S22 | W08 | 06 | 0030 | BETA | Jun 19, 1999 | Jun 25, 1999 | Jul 9, 1999 |
| № 8586 | N34 | W46 | 01 | 0000 | ALPHA | Jun 15, 1999 | Jun 23, 1999 | Jul 7, 1999 |
| № 8585 | N37 | E14 | 06 | 0190 | BETA | Jun 20, 1999 | Jun 28, 1999 | Jul 12, 1999 |
| № 8583 | S13 | W12 | 13 | 0090 | BETA | Jun 18, 1999 | Jun 25, 1999 | Jul 9, 1999 |
| № 8582 | N27 | W48 | 21 | 0130 | BETA | Jun 15, 1999 | Jun 22, 1999 | Jul 6, 1999 |
| № 8580 | S21 | W39 | 08 | 0270 | BETA | Jun 16, 1999 | Jun 23, 1999 | Jul 7, 1999 |
| № 8576 | S27 | W93 | 03 | 0060 | BETA | Jun 12, 1999 | Jun 19, 1999 | Jul 3, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to June 1999. The gray background is the average SSN index.
