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Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 9, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8512 | S27 | E49 | 04 | 0010 | BETA | Apr 14, 1999 | Apr 21, 1999 | May 5, 1999 |
| № 8511 | S17 | E30 | 05 | 0110 | BETA | Apr 13, 1999 | Apr 19, 1999 | May 3, 1999 |
| № 8510 | S35 | E21 | 01 | 0000 | ALPHA | Apr 12, 1999 | Apr 19, 1999 | May 4, 1999 |
| № 8508 | N22 | E09 | 39 | 0190 | BETA-GAMMA | Apr 11, 1999 | Apr 18, 1999 | May 2, 1999 |
| № 8507 | N12 | W13 | 11 | 0070 | BETA | Apr 9, 1999 | Apr 16, 1999 | Apr 30, 1999 |
| № 8506 | S26 | W71 | 05 | 0130 | BETA | Apr 5, 1999 | Apr 12, 1999 | Apr 26, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
