21 May 2025
⇐20250520 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20250522⇒



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W16S45
(181",-656") 		E49-W79
(128) 		17.0 1.6 6.0e21
2 E10N36
(-133",583") 		E19-W05
(24) 		1.0 5.6 1.1e21
3 W09N09
(145",182") 		W06-W12
(6) 		0.2 5.5 1.8e20
4 E47N05
(-696",103") 		E50-E44
(6) 		0.2 -1.8 -8.3e19
5 W03N13
(54",250") 		W02-W05
(3) 		0.0 7.1 4.4e19

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 21-May-2025 23:30 UT .