21 May 2023
20230520 Week Rotation Today Rotation Week 20230522



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W09S17
(136",-242")
E21-W28
(49)
7.3 -4.4 -5.2e21
2 W25S41
(307",-600")
W17-W34
(17)
0.9 -4.2 -7.9e20
3 E66N37
(-694",575")
E70-E58
(12)
0.1 -0.3 -1.3e19
4 W44N10
(651",193")
W42-W46
(4)
0.1 -0.8 -1.3e19

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 21-May-2023 23:30 UT .