1 August 2025
20250731 Week Rotation Today Rotation Week 20250802



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W10N18
(155",197")
W02-W14
(12)
0.9 -4.5 -6.8e20
2 W22N80
(62",910")
E36-W89
(125)
0.5 -0.5 -1.6e20
3 E66S25
(-783",-435")
E80-E55
(25)
0.3 2.2 3.5e20
4 W11S04
(181",-163")
W10-W12
(2)
0.0 -6.8 -4.1e19

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 1-Aug-2025 23:30 UT .