30 April 2025
⇐20250429 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20250501⇒



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 E18N42
(-224",687") 		E47-W01
(48) 		1.8 -3.3 -1.4e21
2 -178
(-82",E05S04") 		16
(1.7e04) 		-4.5 2.8 4.7e20
3 W30N20
(453",378") 		W19-W37
(18) 		1.1 -7.6 -1.6e21
4 W17S19
(263",-253") 		W11-W24
(13) 		0.5 -13.5 -1.1e21
5 E35N31
(-471",541") 		E43-E26
(17) 		0.2 -1.4 -7.2e19
6 E57S30
(-695",-439") 		E67-E49
(18) 		0.2 -3.1 -1.7e20
7 E07N15
(-109",319") 		E08-E05
(3) 		0.1 -3.4 -7.1e19
8 W30S55
(272",-745") 		W27-W34
(7) 		0.1 -1.1 -1.8e19

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 30-Apr-2025 23:30 UT .