31 January 2023
20230130 Week Rotation Today Rotation Week 20230201



Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 W45S13
(678",-147")
W33-W57
(24)
2.2 -1.3 -6.4e20
2 E42N08
(-642",204")
E55-E26
(29)
2.2 -0.4 -1.8e20
3 W14S66
(97",-846")
E16-W30
(46)
1.8 -0.9 -5.3e20
4 W21N39
(276",686")
W19-W26
(7)
0.1 -1.8 -4.8e19
5 E38N15
(-577",336")
E42-E33
(9)
0.1 -1.9 -3.8e19
6 E59N42
(-618",691")
E66-E60
(6)
0.1 -2.8 -1.0e20
7 W58N01
(830",62")
W56-W61
(5)
0.1 -0.4 -7.0e18
8 W40N06
(630",175")
W38-W43
(5)
0.1 -1.0 -1.2e19
9 W26N35
(351",635")
W24-W29
(5)
0.1 -1.0 -1.5e19

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 31-Jan-2023 20:30 UT .