19 September 2021
⇐20210918 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210920⇒

NOAA
2 Active Regions
12871
12870

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 E24S11
(-376",-288") 		E39-W03
(42) 		7.3 -0.8 -1.1e21
2 W33N71
(170",865") 		E83-W82
(165) 		1.9 1.1 8.3e20
3 W24S64
(169",-900") 		E14-W44
(58) 		1.0 -0.8 -4.3e20
4 E57N47
(-554",646") 		E71-E43
(28) 		0.6 0.7 1.6e20
5 W28S09
(448",-247") 		W22-W33
(11) 		0.2 -0.8 -3.7e19
6 E68N60
(-442",799") 		E89-E55
(34) 		0.2 0.7 6.3e19
7 W37S18
(548",-378") 		W34-W40
(6) 		0.0 -0.7 -5.2e18

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 19-Sep-2021 23:30 UT .