No image for the selected date
Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 4, 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) | |
|---|---|---|---|---|---|---|---|---|
| № 8508 | N19 | E79 | 03 | 0050 | ALPHA | Apr 11, 1999 | Apr 18, 1999 | May 2, 1999 |
| № 8507 | N12 | E60 | 05 | 0010 | BETA | Apr 9, 1999 | Apr 16, 1999 | Apr 30, 1999 |
| № 8506 | S26 | W00 | 08 | 0010 | BETA | Apr 5, 1999 | Apr 12, 1999 | Apr 26, 1999 |
| № 8504 | S28 | E13 | 10 | 0070 | BETA | Apr 6, 1999 | Apr 13, 1999 | Apr 27, 1999 |
| № 8498 | N18 | W72 | 01 | 0020 | ALPHA | Mar 30, 1999 | Apr 6, 1999 | Apr 20, 1999 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1970 to April 1999. The gray background is the average SSN index.
