31 January 2025
⇐20250130 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20250201⇒



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W32N16
(492",351") 		E19-W58
(77) 		8.3 3.7 6.0e21
2 W31S48
(336",-668") 		E28-W61
(89) 		6.4 2.7 4.0e21
3 W42S43
(484",-601") 		W33-W53
(20) 		0.2 -2.2 -1.2e20

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 31-Jan-2025 20:30 UT .