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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on June 16, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8588 | S22 | E22 | 02 | 0000 | ALPHA | Jun 19, 1999 | Jun 25, 1999 | Jul 9, 1999 |
| № 8587 | N19 | E07 | 01 | 0000 | ALPHA | Jun 17, 1999 | Jun 24, 1999 | Jul 8, 1999 |
| № 8586 | N34 | W16 | 01 | 0000 | ALPHA | Jun 16, 1999 | Jun 23, 1999 | Jul 7, 1999 |
| № 8585 | N38 | E42 | 07 | 0140 | BETA | Jun 20, 1999 | Jun 28, 1999 | Jul 12, 1999 |
| № 8583 | S12 | E19 | 19 | 0150 | BETA | Jun 18, 1999 | Jun 25, 1999 | Jul 9, 1999 |
| № 8582 | N26 | W18 | 27 | 0220 | BETA | Jun 15, 1999 | Jun 22, 1999 | Jul 6, 1999 |
| № 8581 | S35 | W70 | 01 | 0000 | ALPHA | Jun 11, 1999 | Jun 18, 1999 | Jul 3, 1999 |
| № 8580 | S21 | W09 | 10 | 0230 | BETA | Jun 16, 1999 | Jun 23, 1999 | Jul 7, 1999 |
| № 8578 | N20 | W83 | 01 | 0090 | ALPHA | Jun 10, 1999 | Jun 17, 1999 | Jul 1, 1999 |
| № 8576 | S29 | W64 | 05 | 0100 | BETA | Jun 12, 1999 | Jun 19, 1999 | Jul 3, 1999 |
| № 8575 | N16 | W83 | 01 | 0040 | ALPHA | Jun 11, 1999 | Jun 17, 1999 | Jul 1, 1999 |
| № 8574 | N30 | W89 | 01 | 0050 | ALPHA | Jun 10, 1999 | Jun 17, 1999 | Jul 1, 1999 |
| № 8571 | S20 | W69 | 01 | 0000 | ALPHA | Jun 12, 1999 | Jun 18, 1999 | Jul 2, 1999 |
| № 8570 | S14 | W70 | 01 | 0020 | ALPHA | Jun 12, 1999 | Jun 18, 1999 | Jul 2, 1999 |
| № 8569 | N19 | W70 | 12 | 0230 | BETA | Jun 12, 1999 | Jun 18, 1999 | Jul 2, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to June 1999. The gray background is the average SSN index.
