28 April 2025
20250427 Week Rotation Today Rotation Week 20250429



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W59S47
(555",-674")
W41-W66
(25)
2.8 0.8 9.0e20
2 E05N06
(-76",168")
E16-W09
(25)
2.6 -8.6 -3.5e21
3 E36N39
(-435",650")
E48-E31
(17)
1.4 -2.9 -1.1e21
4 E32S05
(-501",-28")
E39-E26
(13)
0.7 -4.0 -5.2e20
5 W14S47
(159",-642")
W06-W19
(13)
0.2 1.5 6.0e19

Note: Solar Monitor's coronal hole segmentations are performed by CHIMERA, a copy of which is available at: github.com/TCDSolar/CHIMERA.

The operations of the CHIMERA algorithm is described in a peer reviewed paper: arxiv.org/abs/1711.11476.

An extensive copy of coronal hole properties are available at: solarmonitor.org/data.

The latest positions of the coronal holes are given in heliocentric co-ordinates, and the region positions are valid on 28-Apr-2025 23:30 UT .