18 May 2025
⇐20250517 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20250519⇒



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 E12S41
(-154",-595") 		E67-W51
(118) 		16.5 2.4 7.9e21
2 E49N32
(-612",524") 		E63-E40
(23) 		0.5 3.5 4.9e20
3 W07N15
(111",278") 		W03-W10
(7) 		0.1 33.0 5.9e20
4 W08S03
(124",-10") 		W05-W09
(4) 		0.1 8.9 1.5e20
5 E30N44
(-345",677") 		E33-E26
(7) 		0.1 0.9 2.3e19
6 E40N14
(-596",264") 		E42-E39
(3) 		0.0 4.7 4.4e19
7 E42N21
(-596",359") 		E45-E41
(4) 		0.0 7.3 6.5e19

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 18-May-2025 23:30 UT .