22 September 2021
⇐20210921 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210923⇒

NOAA
3 Active Regions
12871
12872
12873

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 W19S05
(318",-198") 		E08-W35
(43) 		7.9 -0.6 -8.0e20
2 E24N57
(-208",742") 		E51-W76
(127) 		6.6 0.8 1.4e21
3 W45S63
(311",-880") 		W36-W58
(22) 		0.1 -0.2 -1.4e19
4 W20S33
(276",-615") 		W18-W22
(4) 		0.0 -0.7 -6.3e18

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 22-Sep-2021 11:30 UT .