Sunspots and active regions
The following active regions with sunspot groups were visible on the Sun on April 4, 2017. 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) | |
|---|---|---|---|---|---|---|---|---|
| № 2649 | N15 | W56 | 04 | 0020 | Beta | Apr 1, 2017 | Apr 7, 2017 | Apr 21, 2017 |
| № 2648 | S03 | E52 | 06 | 0030 | Beta | Apr 9, 2017 | Apr 16, 2017 | Apr 29, 2017 |
| № 2645 | S10 | W38 | 35 | 0700 | Beta-Gamma-Delta | Apr 2, 2017 | Apr 9, 2017 | Apr 22, 2017 |
| № 2644 | N13 | W77 | 12 | 0520 | Beta-Gamma-Delta | Mar 30, 2017 | Apr 6, 2017 | Apr 19, 2017 |
Solar cycle progression
The average monthly sunspot number (SSN) from January 1988 to April 2017. The gray background is the average SSN index.
