4 April 2025
⇐20250403 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20250405⇒



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 E41S28
(-551",-385") 		E71-E27
(44) 		2.3 -5.8 -2.8e21
2 W12N26
(174",518") 		W02-W21
(19) 		1.0 -5.2 -9.4e20
3 E20S02
(-333",59") 		E26-E12
(14) 		0.9 -8.1 -1.1e21
4 W47N15
(684",312") 		W43-W52
(9) 		0.3 -4.2 -3.2e20
5 W06S01
(99",87") 		W02-W09
(7) 		0.3 -1.8 -8.3e19
6 W05N11
(76",283") 		W01-W07
(6) 		0.2 -4.1 -1.5e20
7 E23N68
(-139",921") 		E43-E14
(29) 		0.2 -0.2 -2.5e19
8 W09N42
(111",715") 		W06-W11
(5) 		0.0 2.3 2.0e19

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 4-Apr-2025 23:30 UT .