31 January 2021
⇐20210130 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210201⇒

NOAA
1 Active Region
12800

Flare Forecast
Flare Prediction System
MM MotD

Coronal Holes


Today's Coronal Hole Properties
CHIMERA Number
Centroid
[Heliocentric]
Width
[°]
Area
[%]
< B >
[G]
< Φ >
[Mx]
1 E11N02
(-190",135") 		E27-W12
(39) 		3.0 -0.0 -1.7e19
2 E01S72
(-7",-891") 		E47-W72
(119) 		2.0 -1.2 -9.0e20
3 W21S25
(318",-331") 		W10-W32
(22) 		1.7 -3.2 -9.2e20
4 E41S21
(-595",-277") 		E57-E30
(27) 		1.3 1.9 5.2e20
5 W31N64
(218",910") 		W15-W42
(27) 		0.3 1.6 2.6e20
6 E03N11
(-42",279") 		E04-E01
(3) 		0.1 -1.2 -9.3e18
7 E28N16
(-442",361") 		E30-E26
(4) 		0.0 -0.8 -5.9e18

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-2021 02:30 UT .