21 September 2021
⇐20210920 ⇐Week ⇐Rotation Today Rotation⇒ Week⇒ 20210922⇒

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 W07S08
(122",-240") 		E29-W28
(57) 		7.9 -0.7 -8.8e20
2 E39N55
(-352",723") 		E60-E98
(-38) 		3.9 0.6 6.5e20
3 W53N70
(257",870") 		E40-W67
(107) 		1.4 1.0 6.9e20
4 W34S62
(251",-884") 		W33-W51
(18) 		0.3 -1.2 -1.9e20
5 E17N03
(-288",-69") 		E20-E15
(5) 		0.0 -1.9 -1.1e19

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-Sep-2021 19:30 UT .